diff --git a/lib/Makefile.in b/lib/Makefile.in
index 6706d73ace0..a87b7b1f31b 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -98,6 +98,7 @@ libegnu_a_OBJECTS = $(patsubst %.o,e-%.o,$(for_emacs_OBJECTS))
 
 $(libegnu_a_OBJECTS) $(libgnu_a_OBJECTS): $(BUILT_SOURCES)
 
+.SUFFIXES: .c
 .c.o:
 	$(AM_V_CC)$(CC) -c $(CPPFLAGS) $(ALL_CFLAGS) -o $@ $<
 e-%.o: %.c
diff --git a/lwlib/Makefile.in b/lwlib/Makefile.in
index fbb60b35b24..b2c8d4b6e04 100644
--- a/lwlib/Makefile.in
+++ b/lwlib/Makefile.in
@@ -81,6 +81,7 @@ ALL_CFLAGS= $(C_SWITCH_SYSTEM) $(C_SWITCH_X_SITE) \
   -Demacs -I../src \
   -I$(srcdir) -I$(srcdir)/../src -I../lib -I$(srcdir)/../lib
 
+.SUFFIXES: .c
 .c.o:
 	$(AM_V_CC)$(CC) -c $(CPPFLAGS) $(ALL_CFLAGS) $<
 
diff --git a/oldXMenu/Makefile.in b/oldXMenu/Makefile.in
index cdafe83b7a2..215a3f2b6cf 100644
--- a/oldXMenu/Makefile.in
+++ b/oldXMenu/Makefile.in
@@ -112,6 +112,7 @@ ALL_CFLAGS=$(C_SWITCH_SYSTEM) $(C_SWITCH_MACHINE) \
   $(CPPFLAGS) $(CFLAGS) -DEMACS_BITMAP_FILES \
   -I../src -I../lib -I${srcdir} -I${srcdir}/../src -I${srcdir}/../lib
 
+.SUFFIXES: .c
 .c.o:
 	$(AM_V_CC)$(CC) -c ${ALL_CFLAGS} $<
 
diff --git a/src/Makefile.in b/src/Makefile.in
index cac0b4ea280..7575ecbd07a 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -452,7 +452,7 @@ ALL_OBJC_CFLAGS = $(EMACS_CFLAGS) \
 ALL_CXX_CFLAGS = $(EMACS_CFLAGS) \
   $(filter-out $(NON_CXX_CFLAGS),$(WARN_CFLAGS)) $(CXXFLAGS)
 
-.SUFFIXES: .m .cc
+.SUFFIXES: .c .m .cc
 .c.o:
 	$(AM_V_CC)$(CC) -c $(CPPFLAGS) $(ALL_CFLAGS) $(PROFILING_CFLAGS) $<
 .m.o: