I am installing Postfix and following a tutorial, there is a command that uses 'make' but I have an error message. More precisely :

make makefiles CCARGS='-DDEF_CONFIG_DIR=\"/usr/local/postfix/etc\"'

and the error message : make -f Makefile.in MAKELEVEL= Makefiles (echo "# Do not edit -- this file documents how Postfix was built for your machine."; /bin/sh makedefs) >makedefs.tmp ATTENTION: ATTENTION: Unknown system type: Linux 3.2.0-23-generic-pae ATTENTION: make: * [Makefiles] Error 1 make: * [makefiles] Error 2

I installed 'build-essantial' package but I still have error message. Does anyone has an idea ?