Can't make barnyard2 due to missing glsl link

[armstpat2]

I've been trying for days to build barnyard2. No matter what I do I end up with several errors such as the following:

/usr/bin/ld: output-plugins/libspo.a(spo_database_cache.o): in function cacheSignatureLookup': spo_database_cache.c:(.text+0x1b4): undefined reference to glsl'

I'm running ./configure --with-mysql-libraries=/usr/lib/x86_64-linux-gnu --prefix=$HOME/barnyard2-install
I tried adding -lz -lGL -lpthread to CFLAGS. It didn't work.

Any advice is sincerely appreciated.