[hidden@undernet blockeater]$ gcc blockeater.c -g -o blockeater -Wall -I'/usr/include/mysql' -L'/usr/lib/mysql' -lmysqlclient -lz -lcrypt -lnsl -lm
/usr/lib/mysql/libmysqlclient.a(my_malloc.o)(.text+0x22): In function `my_malloc':
: undefined reference to `errno'
/usr/lib/mysql/libmysqlclient.a(my_malloc.o)(.text+0xb2): In function `my_memdup':
: undefined reference to `errno'
/usr/lib/mysql/libmysqlclient.a(my_malloc.o)(.text+0x18f): In function `my_strdup':
: undefined reference to `errno'
/usr/lib/mysql/libmysqlclient.a(my_realloc.o)(.text+0x53): In function `my_realloc':
: undefined reference to `errno'
/usr/lib/mysql/libmysqlclient.a(my_lib.o)(.text+0x2e3): In function `my_dir':
: undefined reference to `errno'
/usr/lib/mysql/libmysqlclient.a(my_lib.o)(.text+0x3b8): more undefined references to `errno' follow
collect2: ld returned 1 exit status