GNU Patch 2.6.1 fails to build on Darwin

[Ludovic Courtès]

Hello,

Patch 2.6.1 fails to build on Darwin with Apple’s “GCC” [0]:

--8<---------------cut here---------------start------------->8---
gcc -std=gnu99 -c  -DHAVE_CONFIG_H 
-Ded_PROGRAM=\"/nix/store/1dk6yj85f9j1manfrd3001az2r7ggb8n-ed-1.4/bin/ed\" 
-DENABLE_MERGE -I. -I./src -I./gl/lib -g -O2 -o gl/lib/strndup.o 
gl/lib/strndup.c
gl/lib/strndup.c: In function 'strndup':
gl/lib/strndup.c:33: warning: implicit declaration of function 'rpl_strnlen'

[...]

gcc -std=gnu99 -o src/patch -g -O2  gl/lib/argmatch.o gl/lib/backupfile.o 
gl/lib/basename.o gl/lib/dirname.o gl/lib/stripslash.o gl/lib/error.o 
gl/lib/exitfail.o gl/lib/strndup.o gl/lib/strnlen.o gl/lib/getopt.o 
gl/lib/getopt1.o gl/lib/hash.o gl/lib/quote.o gl/lib/quotearg.o 
gl/lib/safe-write.o gl/lib/xmalloc.o gl/lib/xstrndup.o gl/lib/full-write.o 
src/merge.o src/inp.o src/maketime.o src/partime.o src/patch.o src/pch.o 
src/quotesys.o src/util.o src/version.o 
i686-apple-darwin9-gcc-4.0.1: gl/lib/strnlen.o: No such file or directory
--8<---------------cut here---------------end--------------->8---

Thanks,
Ludo’.

[0] http://hydra.nixos.org/build/216441/nixlog/1/raw