diff -Nru glam2-1064/debian/patches/change-fixed-compilers.patch glam2-1064/debian/patches/change-fixed-compilers.patch
--- glam2-1064/debian/patches/change-fixed-compilers.patch	1970-01-01 00:00:00.000000000 +0000
+++ glam2-1064/debian/patches/change-fixed-compilers.patch	2019-03-18 07:16:36.000000000 +0000
@@ -0,0 +1,63 @@
+diff -Nru orig/glam2-1064/purge/Makefile glam2-1064/purge/Makefile
+--- orig/glam2-1064/purge/Makefile	2019-05-24 10:16:05.000000000 +0000
++++ glam2-1064/purge/Makefile	2019-05-24 10:15:39.931223187 +0000
+@@ -3,4 +3,4 @@
+ 
+ # Command for compiling purge:
+ purge: *.c *.h Makefile
+-	cc $(CFLAGS) -o purge *.c -lm $(LDFLAGS)
++	$(CC) $(CFLAGS) -o purge *.c -lm $(LDFLAGS)
+diff -Nru orig/glam2-1064/src/Makefile glam2-1064/src/Makefile
+--- orig/glam2-1064/src/Makefile	2019-05-24 10:16:05.000000000 +0000
++++ glam2-1064/src/Makefile	2019-05-24 10:15:29.875223187 +0000
+@@ -31,39 +31,39 @@
+ 
+ # Command for compiling glam2:
+ glam2: $(GSRC) *.h Makefile
+-	cc $(CFLAGS) -o glam2 $(GSRC) -lm $(LDFLAGS)
++	$(CC) $(CFLAGS) -o glam2 $(GSRC) -lm $(LDFLAGS)
+ 
+ # Command for compiling glam2scan:
+ glam2scan: $(SSRC) *.h Makefile
+-	cc $(CFLAGS) -o glam2scan $(SSRC) -lm $(LDFLAGS)
++	$(CC) $(CFLAGS) -o glam2scan $(SSRC) -lm $(LDFLAGS)
+ 
+ # Command for compiling glam2format:
+ glam2format: $(FSRC) *.h Makefile
+-	cc $(CFLAGS) -o glam2format $(FSRC) -lm $(LDFLAGS)
++	$(CC) $(CFLAGS) -o glam2format $(FSRC) -lm $(LDFLAGS)
+ 
+ # Command for compiling glam2mask:
+ glam2mask: $(MSRC) *.h Makefile
+-	cc $(CFLAGS) -o glam2mask $(MSRC) -lm $(LDFLAGS)
++	$(CC) $(CFLAGS) -o glam2mask $(MSRC) -lm $(LDFLAGS)
+ 
+ # Here follow commands for compiling special versions of the programs
+ 
+ # Compile glam2 including FFT algorithm (requires FFTW to be installed):
+ glam2fft: $(GSRC) convolve.c *.h Makefile
+-	cc $(CFLAGS) -DFFT -o glam2fft $(GSRC) convolve.c -lm -lfftw3 $(LDFLAGS)
++	$(CC) $(CFLAGS) -DFFT -o glam2fft $(GSRC) convolve.c -lm -lfftw3 $(LDFLAGS)
+ 
+ # Compile for debugging with gdb or valgrind, with extra compiler warnings:
+ glam2_d: $(GSRC) *.h Makefile
+-	cc -Wall -W -pedantic -g -o glam2_d $(GSRC) -lm
++	$(CC) -Wall -W -pedantic -g -o glam2_d $(GSRC) -lm
+ glam2scan_d: $(SSRC) *.h Makefile
+-	cc -Wall -W -pedantic -g -o glam2scan_d $(SSRC) -lm
++	$(CC) -Wall -W -pedantic -g -o glam2scan_d $(SSRC) -lm
+ glam2format_d: $(FSRC) *.h Makefile
+-	cc -Wall -W -pedantic -g -o glam2format_d $(FSRC) -lm
++	$(CC) -Wall -W -pedantic -g -o glam2format_d $(FSRC) -lm
+ glam2mask_d: $(MSRC) *.h Makefile
+-	cc -Wall -W -pedantic -g -o glam2mask_d $(MSRC) -lm
++	$(CC) -Wall -W -pedantic -g -o glam2mask_d $(MSRC) -lm
+ 
+ # Compile for profiling with gprof, with extra compiler warnings:
+ # Use -O2 to avoid function inlining
+ glam2_p: $(GSRC) *.h Makefile
+-	cc -Wall -W -pedantic -O2 -pg -o glam2_p $(GSRC) -lm
++	$(CC) -Wall -W -pedantic -O2 -pg -o glam2_p $(GSRC) -lm
+ glam2scan_p: $(SSRC) *.h Makefile
+-	cc -Wall -W -pedantic -O2 -pg -o glam2scan_p $(SSRC) -lm
++	$(CC) -Wall -W -pedantic -O2 -pg -o glam2scan_p $(SSRC) -lm
diff -Nru glam2-1064/debian/patches/series glam2-1064/debian/patches/series
--- glam2-1064/debian/patches/series	2019-03-18 07:16:36.000000000 +0000
+++ glam2-1064/debian/patches/series	2019-03-18 07:16:36.000000000 +0000
@@ -1 +1,2 @@
 hardening.patch
+change-fixed-compilers.patch
diff -Nru glam2-1064/debian/rules glam2-1064/debian/rules
--- glam2-1064/debian/rules	2019-03-18 07:16:36.000000000 +0000
+++ glam2-1064/debian/rules	2019-03-18 07:16:36.000000000 +0000
@@ -12,8 +12,8 @@
 
 override_dh_auto_build:
 	dh_auto_build
-	make --directory=$(SRCDIR) glam2fft
-	make --directory=purge
+	dh_auto_build -B $(SRCDIR) -- glam2fft
+	dh_auto_build -B purge
 
 override_dh_compress:
 	dh_compress --exclude=.pdf