List sources explicitly or generate files in configure scripts.
Section: Features to avoid for portability
Avoid GNU wildcard dependence
makefile
makefile
SRC = main.c util.c api.cExplanation
Some highly portable makefiles avoid GNU-only discovery functions.
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Same sheet · prioritizing Features to avoid for portability
Avoid eval for POSIX portability
Prefer explicit rules over GNU metaprogramming.
Avoid `.ONESHELL` when targeting POSIX make
Keep recipe-line semantics standard.
POSIX-style portable rule
Write simple, explicit file rules compatible with standard make.
Use shell short-circuit safely
Stop on failure explicitly within one recipe line.
Use standard macros
Honor user-overridable standard compiler variables.