The solution may simply be to link with -lrt.
$ cat shmopen.c
#include <sys/mman.h>
#include <stdio.h>
int main() { printf("%p\n", shm_open); return 0; }
$ gcc shmopen.c
/tmp/ccRPQFME.o: In function `main':
shmopen.c:(.text+0x5): undefined reference to `shm_open'
collect2: error: ld returned 1 exit status
$ gcc shmopen.c -lrt && ./a.out
0x400540
$ lsb_release -d
Description: Debian GNU/kFreeBSD 8.0 (jessie)
$ dpkg-query -S /usr/lib/x86_64-kfreebsd-gnu/librt.so
libc0.1-dev:kfreebsd-amd64: /usr/lib/x86_64-kfreebsd-gnu/librt.so
$ apt-cache policy libc0.1-dev | head -2
libc0.1-dev:
Installed: 2.19-13
Jeff
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