update readme

dongyx · May 12, 2022 · 6de781b · 6de781b
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commit 6de781b
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/README.md b/README.md
@@ -33,6 +33,15 @@ execute the following commands in the source tree:
 
 It installs `shsub` to `/usr/local` by default.
 
+Building *shsub* requires:
+
+- `cc`(1): any C compiler which is compatible with *clang* or *gcc*
+
+- `m4`(1): the m4 macro processor
+
+They are all shipped with most Unix variants
+or can be installed from the package manager.
+
 USAGE
 -----