try once more with simpler makefile

Makefile

@@ -51,19 +51,11 @@ datafiles = \
 	qmul~-help.pd \
 	qdiv~-help.pd \
 	${empty}
-	# add nchans~ help
 
-# List externals that need FFTW3
-FFTW_SOURCES = \
-	frft~.c \
-	mc_conv~.c \
-	mc_conv2d~.c \
-
-
-# Add FFTW flags only to specific externals
-$(FFTW_SOURCES:.c=.class.sources.o): cflags += -I$(FFTW_INCLUDE)
-$(FFTW_SOURCES:.c=.class.sources.o): ldflags += -L$(FFTW_LIB)
-$(FFTW_SOURCES:.c=.class.sources.o): ldlibs += -lfftw3
+# FFTW3 specific flags - applied globally
+cflags += -I$(FFTW_INCLUDE)
+ldflags += -L$(FFTW_LIB)
+ldlibs += -lfftw3
 
 objectsdir = ./build
 PDLIBBUILDER_DIR=./pd-lib-builder