gcc -std=c99 -g -o gbm-surface main.c -lgbm -lepoxy -lpng
/usr/lib/gcc/arm-linux-gnueabihf/4.9/../../../libgbm.so: undefined reference to `drmFreeDevice'
/usr/lib/gcc/arm-linux-gnueabihf/4.9/../../../libgbm.so: undefined reference to `drmGetDevices2'
/usr/lib/gcc/arm-linux-gnueabihf/4.9/../../../libgbm.so: undefined reference to `drmFreeDevices'
/usr/lib/gcc/arm-linux-gnueabihf/4.9/../../../libgbm.so: undefined reference to `drmGetDevice2'
collect2: error: ld returned 1 exit status
Makefile:4: recipe for target 'all' failed
make: *** [all] Error 1