[SOLVED] insmod: Unknown symbol in module
ubuntuforums.org › showthreadDec 21, 2009 · Re: insmod: Unknown symbol in module. So I confirm that I was able to solve the problem with a mixture of mine and dwhitney67 Makefiles. I just added EXTRA_CFLAGS += -I$ {PWD}/include to mine Makefile which uses multiple *.c files to generate one *.ko file . It now compiles and runs perfectly!