Major Description
This is a platform available in runConfigure.
The CC variable has not been set.
This should do the trick:
#=============== INTERIX SPECIFIC OPTIONS =========================
ifeq (${PLATFORM}, INTERIX)
CMP= -c ${CXXFLAGS}
CC= ${COMPILER} -c -D${PLATFORM} -D_REENTRANT -fpic
LINK = ${COMPILER} -D${PLATFORM} -fpic ${LDFLAGS}
PLATFORM_LIB_LINK_OPTIONS=-L/usr/local/lib
EXTRA_LINK_OPTIONS=-lc ${EXTRA_LIBS}
SHLIBSUFFIX=.so
endif