have_library: checking for main() in -lc... -------------------- yes

"gcc -o conftest -I. -I/usr/local/lib/ruby/1.8/i686-darwin9.8.0 -I.  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -g -O2 -pipe -fno-common   conftest.c  -L. -L/usr/local/lib -L.      -lruby-static -lc  -ldl -lobjc  "
checked program was:
/* begin */
1: /*top*/
2: int main() { return 0; }
3: int t() { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
/* end */

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