Hi there, It is not possible to override an internal suffix rule within an Automake conditional. Automake puts the conditional marker only on the first line of the self-output rule.
Regards, Ralf touch foo.c cat >configure.ac <<EOF AC_INIT(a,1,b) AM_INIT_AUTOMAKE(foreign) AC_PROG_CC AM_CONDITIONAL(FOO, :) AC_CONFIG_FILES(Makefile) AC_OUTPUT EOF cat >Makefile.am <<EOF SUFFIXES = .c .o bin_PROGRAMS = foo if FOO .c.o: echo hi endif EOF autoreconf -vif ./configure make # error sed -n '/[EMAIL PROTECTED]@/,/^$/p' Makefile.in @[EMAIL PROTECTED]: @am__fastdepCC_TRUE@ if $(COMPILE) -MT $@ -MD -MP -MF "$(DEPDIR)/$*.Tpo" -c -o $@ $<; \ @am__fastdepCC_TRUE@ then mv -f "$(DEPDIR)/$*.Tpo" "$(DEPDIR)/$*.Po"; else rm -f "$(DEPDIR)/$*.Tpo"; exit 1; fi @AMDEP_TRUE@@am__fastdepCC_FALSE@ source='$<' object='$@' libtool=no @AMDEPBACKSLASH@ @AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@ @am__fastdepCC_FALSE@ $(COMPILE) -c $<