How To Fix: fatal error: Python.h: No such file or directory

(cd ./brain/psom && make) make[1]: Entering directory `/home/ubuntu/pyrobot/brain/psom’ (cd csom_src && make _csom.so) make[2]: Entering directory `/home/ubuntu/pyrobot/brain/psom/csom_src’ gcc -c -g -I -I/usr/include/python2.6 som_pak_wrap.c -I/usr/include/python2.6 -Isom_pak-dev som_pak_wrap.c:125: fatal error: Python.h: No such file or directory compilation terminated. make[2]: *** [som_pak_wrap.o] Error 1 make[2]: Leaving directory `/home/ubuntu/pyrobot/brain/psom/csom_src’ make[1]: *** [csom_src/_csom.so] Error 2 make[1]: Leaving directory […]