Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -23,11 +23,15 @@
 dnl Used to disable checking for -pedantic on some platforms where it's broken
 check_pedantic="yes"
 
 case "$host" in
 	m68k-*-amigaos*)
-		OBJCFLAGS="$OBJCFLAGS -noixemul"
+		AS_IF([test x"$OBJCFLAGS" != x""], [
+			OBJCFLAGS="$OBJCFLAGS -noixemul"
+		], [
+			OBJCFLAGS="-O2 -g -noixemul"
+		])
 		LDFLAGS="$LDFLAGS -noixemul"
 
 		enable_shared="no"
 		enable_threads="no"
 		enable_sockets="no"
@@ -54,11 +58,15 @@
 		enable_shared="no"
 		enable_threads="no"
 		;;
 	*-morphos*)
 		AS_IF([test x"$with_ixemul" != x"yes"], [
-			OBJCFLAGS="$OBJCFLAGS -noixemul"
+			AS_IF([test x"$OBJCFLAGS" != x""], [
+				OBJCFLAGS="$OBJCFLAGS -noixemul"
+			], [
+				OBJCFLAGS="-O2 -g -noixemul"
+			])
 			LDFLAGS="$LDFLAGS -noixemul"
 			enable_files="yes"	# Required for reading ENV:
 
 			AC_SUBST(NOIXEMUL, -noixemul)
 			AC_SUBST(OBJFW_RT_AMIGA_LIB, objfw_rt.library)
@@ -86,11 +94,15 @@
 		AS_IF([test x"$DEVKITPSP" = x""], [
 			AC_MSG_ERROR(
 				[DEVKITPSP is not set! Please set DEVKITPSP.])
 		])
 
-		OBJCFLAGS="$OBJCFLAGS -G0"
+		AS_IF([test x"$OBJCFLAGS" != x""], [
+			OBJCFLAGS="$OBJCFLAGS -G0"
+		], [
+			OBJCFLAGS="-O2 -G0"
+		])
 		CPPFLAGS="$CPPFLAGS -I$DEVKITPSP/psp/sdk/include"
 		LDFLAGS="$LDFLAGS -G0"
 		LIBS="$LIBS -L$DEVKITPSP/psp/sdk/lib -lpspdebug -lpspdisplay"
 		LIBS="$LIBS -lpspge -lpspctrl -lpspsdk -lc -lpspnet"
 		LIBS="$LIBS -lpspnet_inet -lpspnet_apctl -lpspnet_resolver"