--- Makefile.orig	2026-04-19 21:17:56.000000000 +0200
+++ Makefile	2026-05-01 17:11:28.000000000 +0200
@@ -4,7 +4,7 @@
 #######################################################################
 
 # Directory where qiv will be installed under.
-PREFIX ?= /usr/local
+PREFIX ?= $(DESTDIR)@PREFIX@
 
 # Fonts to use for statusbar and comments
 STATUSBAR_FONT = "Monospace 9"
@@ -57,8 +57,9 @@
 INSTALL    ?= install
 STRIP_FLAG ?= -s
 CFLAGS     ?= -O2 -Wall \
-	    -fcaller-saves -ffast-math -fno-strength-reduce \
-	    -fthread-jumps
+	    -ffast-math -fno-strength-reduce
+#	    -fcaller-saves -ffast-math -fno-strength-reduce \
+#	    -fthread-jumps
 
 GDK_VERS ?= 3