localhost:~/GNUstep-Darwin/test lars$ /opt/local/bin/gcc -E
-I/opt/local/include -fgnu-runtime
-I/opt/local/GNUstep/System/Library/Headers conftest.c
cc1: warning: command line option "-fgnu-runtime" is valid for
ObjC/ObjC++
but not for C
# 1 "conftest.c"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "conftest.c"
# 12653 "configure"
# 12765 "configure"
# 1 "/usr/include/objc/objc-api.h" 1 3 4
# 12766 "configure" 2
localhost:~/GNUstep-Darwin/test lars$
as one can see here the wrong objc-api.h is found: the one of the NeXT
runtime.