gcc -Iinclude -std=c99 -O3 -W -Wall -Wl,--as-needed -L.libs -o player src/player/main.c -lseom -lX11 -lXv
/usr/lib/gcc-lib/i486-slackware-linux/3.3.6/../../../../i486-slackware-linux/bin/ld: cannot find -lX11
collect2: ld returned 1 exit status
make: *** [player] Error 1