diff --git a/.github/workflows/aunit_tests.yml b/.github/workflows/aunit_tests.yml
index efbb4d4..8d2a225 100644
--- a/.github/workflows/aunit_tests.yml
+++ b/.github/workflows/aunit_tests.yml
@@ -18,10 +18,10 @@ on: [push]
 jobs:
   build:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Setup
       run: |
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 00b22f7..695f9a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,21 @@
 # Changelog
 
 * Unreleased
+* 1.5.0 (2022-12-08)
+    * Support compiling plain `*.c` files in libraries and in the application.
+        * The C files are assumed to be written in C11.
+    * Define the `-D ARDUINO=100` macro.
+        * Some 3rd party libraries test for `ARDUINO >= 100` to check if it's
+          being compiled under Arduino.
+        * Many will compile under EpoxyDuino with this macro set.
+    * Add `make run` target which runs the binary generated by `make all`.
+        * Useful in the `vim` editor where `:make run` will invoke the quickfix
+          feature so that the editor will jump directly to the file and line
+          where the AUnit assertion failure occurred.
+        * Update the example `for` loops to invoke `make -C {dir} run` instead
+          of running the binary directly. The `vim` editor can parse the output
+          caused by the `-C` flag, and automatically generate the correct path
+          to the files in the subdirectories.
 * 1.4.0 (2022-11-06)
     * Add `memcmp_P()` by @dawidchyrzynski in
       [PR#71](https://github.com/bxparks/EpoxyDuino/pull/71).
diff --git a/EpoxyDuino.mk b/EpoxyDuino.mk
index 4537753..c8b4d4a 100644
--- a/EpoxyDuino.mk
+++ b/EpoxyDuino.mk
@@ -68,8 +68,8 @@ EPOXY_DUINO_PARENT_DIR := $(abspath $(EPOXY_DUINO_DIR)/..)
 # directory.
 ARDUINO_LIB_DIRS ?=
 
-# C macro to select a specific core. Valid options are:
-# EPOXY_CORE_AVR (default), EPOXY_CORE_ESP8266.
+# CPP macro to select a specific core. Valid options are:
+# EPOXY_CORE_AVR (default), and EPOXY_CORE_ESP8266.
 EPOXY_CORE ?= EPOXY_CORE_AVR
 
 # Define the directory where the <Arduino.h> and other core API files are
@@ -77,9 +77,10 @@ EPOXY_CORE ?= EPOXY_CORE_AVR
 EPOXY_CORE_PATH ?= $(EPOXY_DUINO_DIR)/cores/epoxy
 
 # Find the directory paths of the libraries listed in ARDUINO_LIBS by looking
-# under directory given by EPOXY_DUINO_LIB_DIR, the directory given by
-# EPOXY_DUINO_PARENT_DIR to look for siblings, and each directory listed in
-# ARDUINO_LIB_DIRS.
+# at the following:
+# 1) under the directory given by EPOXY_DUINO_LIB_DIR,
+# 2) the sibling directories under EPOXY_DUINO_PARENT_DIR, and
+# 3) each directory listed in ARDUINO_LIB_DIRS.
 EPOXY_MODULES := $(foreach lib,$(ARDUINO_LIBS),${EPOXY_DUINO_LIB_DIR}/${lib})
 EPOXY_MODULES += $(foreach lib,$(ARDUINO_LIBS),${EPOXY_DUINO_PARENT_DIR}/${lib})
 EPOXY_MODULES += \
@@ -118,19 +119,29 @@ EPOXY_MODULES += \
 # like c++ on FreeBSD is actualy clang++. It's possible that FreeBSD has the
 # latest GNU version of libstdc++, but I'm not sure.
 #
-# I added EXTRA_CXXFLAGS to allow end-user Makefiles to specify additional
-# CXXFLAGs.
+# The CFLAGS assume that any C files are C11 files (not C99) because my
+# AceTimeC library requires C11. It may be possible to override that by passing
+# the `-std=c99` flag in the EXTRA_CFLAGS variable (which overrides the
+# `-std=c11` flag), but this has not been tested.
+#
+# I added EXTRA_CXXFLAGS and EXTRA_CFLAGS to allow end-user Makefiles to
+# specify additional flags to CXXFLAGS and CFLAGS.
 ifeq ($(UNAME), Linux)
 CXX ?= g++
-CXXFLAGS ?= -Wextra -Wall -std=gnu++11 -fno-exceptions -fno-threadsafe-statics -flto
+CXXFLAGS ?= -Wextra -Wall -std=gnu++11 -flto \
+	-fno-exceptions -fno-threadsafe-statics
+CFLAGS ?= -Wextra -Wall -std=c11 -flto
 else ifeq ($(UNAME), Darwin)
 CXX ?= clang++
 CXXFLAGS ?= -Wextra -Wall -std=c++11 -stdlib=libc++
+CFLAGS ?= -Wextra -Wall -std=c11
 else ifeq ($(UNAME), FreeBSD)
 CXX ?= clang++
 CXXFLAGS ?= -Wextra -Wall -std=c++11 -stdlib=libc++
+CFLAGS ?= -Wextra -Wall -std=c11
 endif
 CXXFLAGS += $(EXTRA_CXXFLAGS)
+CFLAGS += $(EXTRA_CFLAGS)
 
 # Pre-processor flags (-I, -D, etc), mostly for header files.
 CPPFLAGS += $(EXTRA_CPPFLAGS)
@@ -138,7 +149,7 @@ CPPFLAGS += $(EXTRA_CPPFLAGS)
 # instead of Arduino.h so that files like 'compat.h' can determine the
 # compile-time environment without having to include <Arduino.h>.
 # Also define UNIX_HOST_DUINO for backwards compatibility.
-CPPFLAGS += -D UNIX_HOST_DUINO -D EPOXY_DUINO -D $(EPOXY_CORE)
+CPPFLAGS += -D ARDUINO=100 -D UNIX_HOST_DUINO -D EPOXY_DUINO -D $(EPOXY_CORE)
 # Add the header files for the Core files.
 CPPFLAGS += -I$(EPOXY_CORE_PATH)
 # Add the header files for libraries. Old Arduino libraries place the header
@@ -150,9 +161,9 @@ CPPFLAGS += $(foreach module,$(EPOXY_MODULES),$(CPPFLAGS_EXPANSION))
 # Linker settings (e.g. -lm).
 LDFLAGS ?=
 
-# Generate list of C++ srcs to compile.
+# Collect list of C and C++ srcs to compile.
 #
-# 1) Add the source files in the Core directory. Support subdirectory
+# 1) Collect the source files in the Epoxy Core directory. Support subdirectory
 # expansions up to 3 levels below the given target. (There might be a better
 # way to do this using GNU Make but I can't find a mechanism that doesn't barf
 # when the 'src/' directory doesn't exist.)
@@ -160,23 +171,41 @@ EPOXY_SRCS := $(wildcard $(EPOXY_CORE_PATH)/*.cpp) \
 	$(wildcard $(EPOXY_CORE_PATH)/*/*.cpp) \
 	$(wildcard $(EPOXY_CORE_PATH)/*/*/*.cpp) \
 	$(wildcard $(EPOXY_CORE_PATH)/*/*/*/*.cpp)
-# 2) Add the source files of the libraries. Old Arduino libraries place the
-# source files at the top level. Later Arduino libraries put the source files
-# under the src/ directory. Also support 3 levels of subdirectories.
-MODULE_EXPANSION = $(wildcard $(module)/*.cpp) \
+# 2) Collect the source files of the libraries referenced by the EPOXY_MODULES
+# parameter. Old Arduino libraries place the source files at the top level.
+# Later Arduino libraries put the source files under the src/ directory. Also
+# support 3 levels of subdirectories. Support both C and C++ libraries files.
+MODULE_EXPANSION_CPP = $(wildcard $(module)/*.cpp) \
 	$(wildcard $(module)/src/*.cpp) \
 	$(wildcard $(module)/src/*/*.cpp) \
 	$(wildcard $(module)/src/*/*/*.cpp) \
 	$(wildcard $(module)/src/*/*/*/*.cpp)
-EPOXY_SRCS += $(foreach module,$(EPOXY_MODULES),$(MODULE_EXPANSION))
-# 3) Add the source files in the application directory, also 3 levels down.
-EPOXY_SRCS += $(wildcard *.cpp) $(wildcard */*.cpp) $(wildcard */*/*.cpp) \
+MODULE_EXPANSION_C = $(wildcard $(module)/*.c) \
+	$(wildcard $(module)/src/*.c) \
+	$(wildcard $(module)/src/*/*.c) \
+	$(wildcard $(module)/src/*/*/*.c) \
+	$(wildcard $(module)/src/*/*/*/*.c)
+MODULE_SRCS_CPP += $(foreach module,$(EPOXY_MODULES),$(MODULE_EXPANSION_CPP))
+MODULE_SRCS_C += $(foreach module,$(EPOXY_MODULES),$(MODULE_EXPANSION_C))
+# 3) Collect the source files in the application directory, also 3 levels down.
+APP_SRCS_CPP += $(wildcard *.cpp) \
+	$(wildcard */*.cpp) \
+	$(wildcard */*/*.cpp) \
 	$(wildcard */*/*/*.cpp)
-
-# Objects including *.o from *.ino
-OBJS += $(EPOXY_SRCS:%.cpp=%.o) $(APP_NAME).o
-
-# Finally, the rule to generate the binary for the application.
+APP_SRCS_C += $(wildcard *.c) \
+	$(wildcard */*.c) \
+	$(wildcard */*/*.c) \
+	$(wildcard */*/*/*.c)
+
+# Generate the list of object files from the *.cpp, *.c, and *.ino files.
+OBJS += $(EPOXY_SRCS:%.cpp=%.o)
+OBJS += $(MODULE_SRCS_CPP:%.cpp=%.o)
+OBJS += $(MODULE_SRCS_C:%.c=%.o)
+OBJS += $(APP_SRCS_CPP:%.cpp=%.o)
+OBJS += $(APP_SRCS_C:%.c=%.o)
+OBJS +=$(APP_NAME).o
+
+# Finally the rule to generate the *.out binary file for the application.
 $(APP_NAME).out: $(OBJS)
 	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $@ $^ $(LDFLAGS)
 
@@ -184,18 +213,36 @@ $(APP_NAME).out: $(OBJS)
 $(APP_NAME).o: $(APP_NAME).ino $(DEPS)
 	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -x c++ -c $<
 
-%.o: %.cpp
-	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@
-
-# This simple rule does not capture all header dependencies of a given cpp
-# file. Maybe it's better to make each cpp to depend on all headers of a given
-# module, and force a recompilation of all cpp files. As far as I understand,
-# this is what the Arduino IDE does upon each compile iteration.
+# We don't need this rule because the implicit GNU Make rules for converting
+# *.c and *.cpp into *.o files are sufficient.
+#
+# %.o: %.cpp
+#	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@
+
+# The following simple rules do not capture all header dependencies of a given
+# *.cpp or *.c file. It's probably better to make each *.cpp and *.c to depend
+# on all headers of a given module, and force a recompilation of all the files.
+# As far as I understand, this is what the Arduino IDE does upon each compile
+# iteration. But this is good enough for now, but has the disadvantage that we
+# have to run `make clean` more often than necessary to reset all the
+# dependencies.
 %.cpp: %.h
+%.c: %.h
 
-.PHONY: all clean $(MORE_CLEAN)
+.PHONY: all clean run $(MORE_CLEAN)
 
+# Use 'make all' or just 'make' to compile the binary.
 all: $(APP_NAME).out
 
+# Use 'make run' to run the binary created by 'make all'. This is useful when
+# the (APP_NAME).out is an AUnit unit test. You can execute ': make run' inside
+# the vim editor. The error message of AUnit (as of v1.7) is compatible with
+# the quickfix errorformat of vim, so vim will automatically detect assertion
+# errors and jump directly to the line where the assertion failed.
+run:
+	./$(APP_NAME).out
+
+# Use 'make clean' to remove intermediate '*.o' files, the target '*.out' file,
+# and any generated files defined by $(GENERATED).
 clean: $(MORE_CLEAN)
 	rm -f $(OBJS) $(APP_NAME).out $(GENERATED)
diff --git a/README.md b/README.md
index 57b6997..12c5ab8 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,7 @@ The disadvantages are:
   environments (e.g. 16-bit `int` versus 32-bit `int`, or 32-bit `long` versus
   64-bit `long`).
 
-**Version**: 1.4.0 (2022-11-06)
+**Version**: 1.5.0 (2022-12-08)
 
 **Changelog**: See [CHANGELOG.md](CHANGELOG.md)
 
@@ -195,11 +195,20 @@ $ make clean
 $ make
 ```
 
-The executable will be created with a `.out` extension. To run it, just type:
+The executable will be created with a `.out` extension. To run it, type
+one of the following:
 ```
 $ ./BlinkSOS.out
+$ make run
 ```
 
+If you run `:make run` command inside the `vim` editor, it knows how to parse
+the file and line number contained in the assertion messages generated by
+[AUnit](https://github.com/bxparks/AUnit). The `vim` editor will jump directly
+to the file and line where the assertion failure occurred. See
+https://vimhelp.org/quickfix.txt.html for information on the `quickfix` feature
+and the `errorformat` format that parses the GNU Make output.
+
 The output that would normally be printed on the `Serial` on an Arduino
 board will be sent to the `STDOUT` of the Linux, MacOS, or FreeBSD terminal. The
 output should be identical to what would be shown on the serial port of the
@@ -233,6 +242,13 @@ for these additional libraries at the following locations:
 * under each of the additional directories listed in `ARDUINO_LIB_DIRS` (see
   below)
 
+Version v1.5 supports compiling and linking plain C files in the third-party
+libraries (defined by `ARDUINO_LIBS`) or in the application directory itself.
+The C files are assumed to be written in C11 and are compiled using the `cc`
+compiler. It may be possible to override the compiler flags by adding `-std=c99`
+into the `EXTRA_CFLAGS` in the Makefile (which clobbers the default `-std=c11`)
+but this has not been tested.
+
 <a name="AdditionalLibraryLocations"></a>
 ### Additional Arduino Library Locations
 
@@ -404,7 +420,7 @@ runtests:
 	set -e; \
 	for i in *Test/Makefile; do \
 		echo '==== Running:' $$(dirname $$i); \
-		$$(dirname $$i)/$$(dirname $$i).out; \
+		$(MAKE) -C $$(dirname $$i) run; \
 	done
 
 clean:
@@ -426,7 +442,16 @@ $ make -C tests tests
 $ make -C tests runtests | grep failed
 ```
 
-These parent Makefiles can be used in Continuous Integration, as shown below.
+If you run `:make runtests` inside the `vim` editor, it knows how to parse the
+diagnostic outputs generated by GNU Make (as it changes directories through the
+`-C` flag), and it knows how to parse the file and line number contained in the
+assertion messages generated by [AUnit](https://github.com/bxparks/AUnit). The
+`vim` editor will jump directly to the file and line where the assertion failure
+occurred. See https://vimhelp.org/quickfix.txt.html for information on the
+`quickfix` feature and the `errorformat` format that parses the GNU Make output.
+
+These parent Makefiles can also be used in Continuous Integration, as shown
+below.
 
 <a name="ContinuousIntegration"></a>
 ### Continuous Integration
@@ -461,8 +486,16 @@ you can use that instead by specifying the `CXX` makefile variable:
 ```
 $ make CXX=clang++
 ```
-(This tells `make` to set the `CXX` variable to `clang++` within the context of
-`EpoxyDuino.mk` which causes `clang++` to be used over the default `g++`.)
+
+This tells `make` to set the `CXX` variable to `clang++` within the context of
+`EpoxyDuino.mk` which causes `clang++` to be used over the default `g++`.
+
+If you have C files in your library or application, you can use to following to
+compile the C files using `clang` instead of `cc` (which is the same as `gcc` on
+Linux):
+```
+$ make CXX=clang++ CC=clang
+```
 
 One reason to use `clang++` instead of `g++` is that the `clang++` compiler will
 sometimes catch a different set of programming errors.
@@ -487,6 +520,12 @@ variable, like this:
 $ make EXTRA_CXXFLAGS='-g'
 ```
 
+or
+
+```
+$ make EXTRA_CXXFLAGS='-g' EXTRA_CFLAGS='-g'
+```
+
 <a name="AdditionalCleanUp"></a>
 ### Additional Clean Up
 
@@ -822,6 +861,35 @@ The `pin` parameter should satisfy `0 <= pin < 32`. If `pin >= 32`, then
 <a name="SupportedArduinoFeatures"></a>
 ## Supported Arduino Features
 
+<a name="ArduinoMacros"></a>
+### Arduino Macros
+
+The following C-preprocessor macros are defined:
+
+* `ARDUINO=100`
+    * Indicates compilation under Arduino.
+* `EPOXY_DUINO`
+    * Indicates compilation under EpoxyDuino
+* `UNIX_HOST_DUINO`
+    * For backwards compatibility with previous version of `EpoxyDuino`
+      which was named `UnixHostDuino`.
+* `EPOXY_CORE_AVR`
+    * Defined when the Makefile variable `EPOXY_CORE` is set to
+      `ARDUINO_ARCH_AVR`.
+    * This is the default.
+* `EPOXY_CORE_ESP8266`
+    * Defined when the Makefile variable `EPOXY_CORE` is set to
+      `ARDUINO_ARCH_ESP8266`.
+
+The following are **not** defined. Many third party libraries tend to break with
+those defined because EpoxyDuino does not emulate those environments perfectly:
+
+* `ARDUINO_ARCH_AVR`
+* `ARDUINO_ARCH_ESP8266`
+* `ARDUINO_ARCH_ESP32`
+* `ESP8266`
+* `ESP32`
+
 <a name="ArduinoFunctions"></a>
 ### Arduino Functions
 
diff --git a/cores/epoxy/Arduino.h b/cores/epoxy/Arduino.h
index 41e1d85..6e7ae2d 100644
--- a/cores/epoxy/Arduino.h
+++ b/cores/epoxy/Arduino.h
@@ -14,8 +14,8 @@
 #define EPOXY_DUINO_EPOXY_ARDUINO_H
 
 // xx.yy.zz => xxyyzz (without leading 0)
-#define EPOXY_DUINO_VERSION 10400
-#define EPOXY_DUINO_VERSION_STRING "1.4.0"
+#define EPOXY_DUINO_VERSION 10500
+#define EPOXY_DUINO_VERSION_STRING "1.5.0"
 
 #include <algorithm> // min(), max()
 #include <cmath> // abs()
diff --git a/examples/Makefile b/examples/Makefile
index 4c34194..a63c8d8 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -2,7 +2,7 @@ all:
 	set -e; \
 	for i in */Makefile; do \
 		echo '==== Making:' $$(dirname $$i); \
-		$(MAKE) -C $$(dirname $$i) -j; \
+		$(MAKE) -C $$(dirname $$i); \
 	done
 
 clean:
diff --git a/libraries/EpoxyEepromAvr/examples/Makefile b/libraries/EpoxyEepromAvr/examples/Makefile
index 4c34194..a63c8d8 100644
--- a/libraries/EpoxyEepromAvr/examples/Makefile
+++ b/libraries/EpoxyEepromAvr/examples/Makefile
@@ -2,7 +2,7 @@ all:
 	set -e; \
 	for i in */Makefile; do \
 		echo '==== Making:' $$(dirname $$i); \
-		$(MAKE) -C $$(dirname $$i) -j; \
+		$(MAKE) -C $$(dirname $$i); \
 	done
 
 clean:
diff --git a/libraries/EpoxyEepromAvr/tests/Makefile b/libraries/EpoxyEepromAvr/tests/Makefile
index 5529273..c018e96 100644
--- a/libraries/EpoxyEepromAvr/tests/Makefile
+++ b/libraries/EpoxyEepromAvr/tests/Makefile
@@ -2,14 +2,14 @@ tests:
 	set -e; \
 	for i in *Test/Makefile; do \
 		echo '==== Making:' $$(dirname $$i); \
-		$(MAKE) -C $$(dirname $$i) -j; \
+		$(MAKE) -C $$(dirname $$i); \
 	done
 
 runtests:
 	set -e; \
 	for i in *Test/Makefile; do \
 		echo '==== Running:' $$(dirname $$i); \
-		$$(dirname $$i)/$$(dirname $$i).out; \
+		$(MAKE) -C $$(dirname $$i) run; \
 	done
 
 clean:
diff --git a/libraries/EpoxyEepromEsp/examples/Makefile b/libraries/EpoxyEepromEsp/examples/Makefile
index 4c34194..a63c8d8 100644
--- a/libraries/EpoxyEepromEsp/examples/Makefile
+++ b/libraries/EpoxyEepromEsp/examples/Makefile
@@ -2,7 +2,7 @@ all:
 	set -e; \
 	for i in */Makefile; do \
 		echo '==== Making:' $$(dirname $$i); \
-		$(MAKE) -C $$(dirname $$i) -j; \
+		$(MAKE) -C $$(dirname $$i); \
 	done
 
 clean:
diff --git a/libraries/EpoxyEepromEsp/tests/Makefile b/libraries/EpoxyEepromEsp/tests/Makefile
index 5529273..c018e96 100644
--- a/libraries/EpoxyEepromEsp/tests/Makefile
+++ b/libraries/EpoxyEepromEsp/tests/Makefile
@@ -2,14 +2,14 @@ tests:
 	set -e; \
 	for i in *Test/Makefile; do \
 		echo '==== Making:' $$(dirname $$i); \
-		$(MAKE) -C $$(dirname $$i) -j; \
+		$(MAKE) -C $$(dirname $$i); \
 	done
 
 runtests:
 	set -e; \
 	for i in *Test/Makefile; do \
 		echo '==== Running:' $$(dirname $$i); \
-		$$(dirname $$i)/$$(dirname $$i).out; \
+		$(MAKE) -C $$(dirname $$i) run; \
 	done
 
 clean:
diff --git a/libraries/EpoxyFS/examples/Makefile b/libraries/EpoxyFS/examples/Makefile
index 4c34194..a63c8d8 100644
--- a/libraries/EpoxyFS/examples/Makefile
+++ b/libraries/EpoxyFS/examples/Makefile
@@ -2,7 +2,7 @@ all:
 	set -e; \
 	for i in */Makefile; do \
 		echo '==== Making:' $$(dirname $$i); \
-		$(MAKE) -C $$(dirname $$i) -j; \
+		$(MAKE) -C $$(dirname $$i); \
 	done
 
 clean:
diff --git a/libraries/EpoxyFS/tests/Makefile b/libraries/EpoxyFS/tests/Makefile
index 5529273..c018e96 100644
--- a/libraries/EpoxyFS/tests/Makefile
+++ b/libraries/EpoxyFS/tests/Makefile
@@ -2,14 +2,14 @@ tests:
 	set -e; \
 	for i in *Test/Makefile; do \
 		echo '==== Making:' $$(dirname $$i); \
-		$(MAKE) -C $$(dirname $$i) -j; \
+		$(MAKE) -C $$(dirname $$i); \
 	done
 
 runtests:
 	set -e; \
 	for i in *Test/Makefile; do \
 		echo '==== Running:' $$(dirname $$i); \
-		$$(dirname $$i)/$$(dirname $$i).out; \
+		$(MAKE) -C $$(dirname $$i) run; \
 	done
 
 clean:
diff --git a/libraries/EpoxyMockDigitalWriteFast/examples/Makefile b/libraries/EpoxyMockDigitalWriteFast/examples/Makefile
index 4c34194..a63c8d8 100644
--- a/libraries/EpoxyMockDigitalWriteFast/examples/Makefile
+++ b/libraries/EpoxyMockDigitalWriteFast/examples/Makefile
@@ -2,7 +2,7 @@ all:
 	set -e; \
 	for i in */Makefile; do \
 		echo '==== Making:' $$(dirname $$i); \
-		$(MAKE) -C $$(dirname $$i) -j; \
+		$(MAKE) -C $$(dirname $$i); \
 	done
 
 clean:
diff --git a/library.json b/library.json
index d5d16dd..020c729 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
     "name": "EpoxyDuino",
-    "version": "1.4.0",
+    "version": "1.5.0",
     "description": "Compile and run Arduino programs natively on Linux, MacOS and FreeBSD.",
     "keywords": [
         "unit-test",
diff --git a/tests/Makefile b/tests/Makefile
index 3cd6316..1677e18 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -11,7 +11,7 @@ tests:
 	for i in *Test/Makefile; do \
 		echo '==== Making:' $$(dirname $$i); \
 		$(MAKE) -C $$(dirname $$i) clean; \
-		$(MAKE) -C $$(dirname $$i) -j; \
+		$(MAKE) -C $$(dirname $$i); \
 	done
 
 runtests:
@@ -19,8 +19,8 @@ runtests:
 	for i in *Test/Makefile; do \
 		echo '==== Running:' $$(dirname $$i); \
 		$(MAKE) -C $$(dirname $$i) clean; \
-		$(MAKE) -C $$(dirname $$i) -j all; \
-		$$(dirname $$i)/$$(dirname $$i).out; \
+		$(MAKE) -C $$(dirname $$i) all; \
+		$(MAKE) -C $$(dirname $$i) run; \
 	done
 
 clean: