-SOURCE_IMG = $(wildcard img/*.dia)
-PS_IMG = $(SOURCE_IMG:.dia=.ps)
-EPS_IMG = $(SOURCE_IMG:.dia=.eps)
-PDF_IMG = $(SOURCE_IMG:.dia=.pdf)
-SOURCE = $(wildcard sources/*.c) $(wildcard sources/*.h) sources/Makefile
+SRC_IMG = $(wildcard img/*.dia)
+PS_IMG = $(SRC_IMG:.dia=.ps)
+EPS_IMG = $(SRC_IMG:.dia=.eps)
+PDF_IMG = $(SRC_IMG:.dia=.pdf)
+SRC = $(wildcard sources/*.c) $(wildcard sources/*.h) sources/Makefile