diff -durN snes9x-1.54.1.orig/unix/configure.ac snes9x-1.54.1/unix/configure.ac
--- snes9x-1.54.1.orig/unix/configure.ac	2016-10-15 02:20:34.000000000 +0200
+++ snes9x-1.54.1/unix/configure.ac	2017-02-04 18:52:33.297396407 +0100
@@ -55,50 +55,6 @@
 # *****************************
 # *** Execution begins here ***
 # *****************************
-
-# Remove -g and -O2 flags manually.
-
-if test "x$CFLAGS" != "x"; then
-	CFLAGS="`echo \"$CFLAGS\" | sed -e 's/-g//'`"
-	CFLAGS="`echo \"$CFLAGS\" | sed -e 's/-O2//'`"
-fi
-
-if test "x$CXXFLAGS" != "x"; then
-	CXXFLAGS="`echo \"$CXXFLAGS\" | sed -e 's/-g//'`"
-	CXXFLAGS="`echo \"$CXXFLAGS\" | sed -e 's/-O2//'`"
-fi
-
-# Test what compiler flags we should use.
-
-AC_ARG_ENABLE([debug],
-	[AS_HELP_STRING([--enable-debug],
-		[leave debug information in the final binary (default: no)])],
-	[], [enable_debug="no"])
-
-if test "x$enable_debug" = "xyes"; then
-	AC_S9X_COMPILER_FLAG([-g],  [g])
-	AC_S9X_COMPILER_FLAG([-O0], [o0])
-else
-	AC_S9X_COMPILER_FLAG([-O3], [o3], [
-		AC_S9X_COMPILER_FLAG([-O2], [o2], [
-			AC_S9X_COMPILER_FLAG([-O1], [o1])])])
-	AC_S9X_COMPILER_FLAG([-fomit-frame-pointer], [omit_frame_pointer])
-fi
-
-AC_ARG_ENABLE([mtune],
-	[AS_HELP_STRING([--enable-mtune],
-		[use the specified value for the -mtune/-mcpu flag (default: no)])],
-	[], [enable_mtune="no"])
-
-if test "x$enable_mtune" != "xno"; then
-	AC_S9X_COMPILER_FLAG([-mtune="$enable_mtune"], [mtune],
-	[
-		AC_MSG_WARN([-mtune failed, trying -mcpu...])
-		AC_S9X_COMPILER_FLAG([-mcpu="$enable_mtune"], [mcpu],
-			[AC_MSG_ERROR([Please specify a working value for --enable-mtune.])])
-	])
-fi
-
 AC_S9X_COMPILER_FLAG([-fno-exceptions],       [no_exceptions])
 AC_S9X_COMPILER_FLAG([-fno-rtti],             [no_rtti])
 AC_S9X_COMPILER_FLAG([-pedantic],             [pedantic])
diff -durN snes9x-1.54.1.orig/unix/Makefile.in snes9x-1.54.1/unix/Makefile.in
--- snes9x-1.54.1.orig/unix/Makefile.in	2016-10-15 02:20:34.000000000 +0200
+++ snes9x-1.54.1/unix/Makefile.in	2017-02-04 18:52:02.039108126 +0100
@@ -47,7 +47,7 @@
 	exit 1
 
 snes9x: $(OBJECTS)
-	$(CCC) $(INCLUDES) -o $@ $(OBJECTS) -lm @S9XLIBS@
+	$(CCC) $(LDFLAGS) $(INCLUDES) -o $@ $(OBJECTS) -lm @S9XLIBS@
 
 ../jma/s9x-jma.o: ../jma/s9x-jma.cpp
 	$(CCC) $(INCLUDES) -c $(CCFLAGS) -fexceptions $*.cpp -o $@