diff --git a/srcpkgs/flashrom/template b/srcpkgs/flashrom/template
index 2128b8e99b0..7c1d30c99a0 100644
--- a/srcpkgs/flashrom/template
+++ b/srcpkgs/flashrom/template
@@ -12,7 +12,23 @@ homepage="https://www.flashrom.org"
 distfiles=https://github.com/flashrom/flashrom/archive/v$version.tar.gz
 checksum=a5bac412cefb87bb426912fed46ccc38799d088a9b92dbe7bac38c5df016d9b2
 
-pre_build() {
-	vsed -i "s:sbin:bin:g" Makefile
-	vsed -i 's/u_int\([0-9]*\)_t/uint\1_t/' $(find -name '*.[ch]')
+post_patch() {
+	# The Makefile detection is fragile!!!
+	# It doesn't defend against __attribute__("something")
+	case "$XBPS_TARGET_MACHINE" in
+		x86_64* | i686*) _arch=x86 ;;
+		aarch64* | arm*) _arch=arm ;;
+		ppc*)            _arch=ppc ;;
+		mips*)           _arch=mips ;;
+		*) msg_error "Unknown arch\n" ;;
+	esac
+	case "$XBPS_TARGET_ENDIAN" in
+		be) _endian=big ;;
+		le) _endian=little ;;
+	esac
+	vsed -i -e 's/^override TARGET_OS :=.*/TARGET_OS := Linux/' \
+		-e "s/^override ARCH :=.*/ARCH := $_arch/" \
+		-e "s/^override ENDIAN :=.*/ENDIAN := $_endian/" \
+		-e 's/sbin/bin/' \
+		Makefile
 }