diff --git a/build1.sh b/build1.sh
index b971c33965..50ad3d165d 100755
--- a/build1.sh
+++ b/build1.sh
@@ -3,20 +3,36 @@
 set -e
 set -x
 
-mkdir -p ./build
-cd build
+SRCDIR=`pwd`
+CMAKE_PREFIX_PATH="$CMAKE_PREFIX_PATH_LPYTHON;$CONDA_PREFIX"
 
-cmake .. \
+# if we are in a pixi project, use the pixi "host" environment for the dependencies
+if [[ ! -z $PIXI_PROJECT_ROOT ]]; then
+   CMAKE_PREFIX_PATH=$PIXI_PROJECT_ROOT/.pixi/envs/host/
+   OUTOFTREE=false
+
+   if [[ ! -f src/libasr/asr.h ]]; then
+       pixi run build_0
+   fi
+fi
+
+# if the outoftree env var is set to true, create a build directory
+if [[ "$OUTOFTREE" == "true" ]]; then
+    mkdir -p build
+    cd build
+fi
+
+
+cmake $SRCDIR \
     -GNinja \
     -DCMAKE_BUILD_TYPE=Debug \
     -DWITH_LLVM=yes \
     -DLPYTHON_BUILD_ALL=yes \
     -DWITH_STACKTRACE=yes \
     -DWITH_RUNTIME_STACKTRACE=yes \
-    -DWITH_INTRINSIC_MODULES=yes \
     -DWITH_LSP=no \
     -DWITH_LFORTRAN_BINARY_MODFILES=no \
-    -DCMAKE_PREFIX_PATH="$PIXI_PROJECT_ROOT/.pixi/envs/host/" \
-    -DCMAKE_INSTALL_PREFIX=`pwd`/inst \
+    -DCMAKE_PREFIX_PATH=$CMAKE_PREFIX_PATH \
+    -DCMAKE_INSTALL_PREFIX=`pwd`/inst
 
-cmake --build . --target install
+cmake --build . -j --target install
diff --git a/ci/environment.yml b/ci/environment.yml
index db5ded2261..7f858da8e9 100644
--- a/ci/environment.yml
+++ b/ci/environment.yml
@@ -18,5 +18,6 @@ dependencies:
   - zstd=1.5.6
   - ninja=1.11.0
   - rapidjson=1.1.0
+  - ninja
 #  - bison=3.4  [not win]
 #  - m2-bison=3.4  [win]
diff --git a/environment_unix.yml b/environment_unix.yml
index af7dffcff0..01164f8d80 100644
--- a/environment_unix.yml
+++ b/environment_unix.yml
@@ -4,7 +4,7 @@ channels:
 dependencies:
   - git
   - pip
-  - make
+  - ninja
   - re2c
   - toml
   - zlib
diff --git a/integration_tests/run_tests.py b/integration_tests/run_tests.py
index e5df7cf909..0bdf78aba5 100755
--- a/integration_tests/run_tests.py
+++ b/integration_tests/run_tests.py
@@ -54,6 +54,7 @@ def main():
 
     # Setup
     global DEFAULT_THREADS_TO_USE, fast_tests, python_libs_req
+
     os.environ["PATH"] = LPYTHON_PATH + os.pathsep + os.environ["PATH"]
     # delete previously created directories (if any)
     for backend in SUPPORTED_BACKENDS:
diff --git a/pixi.lock b/pixi.lock
index 3f209e61a7..c81dbb6cf7 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -32,9 +32,11 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/libedit-3.1.20191231-hc8eb9b7_2.tar.bz2
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/libev-4.33-h93a5062_2.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/libexpat-2.6.2-hebf3989_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/osx-arm64/libffi-3.4.2-h3422bc3_5.tar.bz2
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/libiconv-1.17-h0d3ecfb_2.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/libllvm16-16.0.6-haab561b_3.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/libnghttp2-1.58.0-ha4dd798_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/osx-arm64/libsqlite-3.46.0-hfb93653_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/libssh2-1.11.0-h7a5bd25_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/libuv-1.48.0-h93a5062_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/libxml2-2.12.7-ha661575_1.conda
@@ -44,9 +46,14 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/ncurses-6.5-hb89a1cb_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/ninja-1.12.1-h420ef59_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/openssl-3.3.1-hfb2fe0b_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/osx-arm64/python-3.10.2-h38ef502_4_cpython.tar.bz2
+      - conda: https://conda.anaconda.org/conda-forge/osx-arm64/readline-8.2-h92ec313_1.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/rhash-1.4.4-hb547adb_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/sigtool-0.1.3-h44b9a77_0.tar.bz2
+      - conda: https://conda.anaconda.org/conda-forge/osx-arm64/sqlite-3.46.0-h5838104_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/tapi-1100.0.11-he4954df_0.tar.bz2
+      - conda: https://conda.anaconda.org/conda-forge/osx-arm64/tk-8.6.13-h5083fa2_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/tzdata-2024a-h0c530f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/xz-5.2.6-h57fd34a_0.tar.bz2
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/zstd-1.5.6-hb46c0d2_0.conda
   default:
diff --git a/pixi.toml b/pixi.toml
index 033d21aef1..e2202acbb6 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -30,10 +30,13 @@ zstd-static = "1.5.5.*"
 cxx-compiler = "*"
 cmake = "*"
 ninja = "*"
+python = "3.10.2.*"
 
 [feature.compiler.tasks]
-build_1 = { cmd = "sh build1.sh", depends-on = ["build_0"] }
+build_1 = { cmd = "sh build1.sh" }
 build = { depends-on = ["build_0", "build_1"] }
+test = { cmd = "python ./integration_tests/run_tests.py"}
+
 
 [environments]
 compiler = ["compiler"]