improve configure

1 files changed, 3 insertions, 0 deletions

diff --git a/configure b/configure
index 1621b58bb..6cda002c0 100755
--- a/configure
+++ b/configure
@@ -3580,7 +3580,10 @@ _gmake_add_switches() {
     echo "endif" >> "${xmake_sh_makefile}"
     echo "" >> "${xmake_sh_makefile}"
     echo "ifneq (\$(PREFIX),)" >> "${xmake_sh_makefile}"
+    echo "ifneq (\$(INSTALLDIR),)" >> "${xmake_sh_makefile}"
     echo "INSTALLDIR:=\$(INSTALLDIR)/\$(PREFIX)" >> "${xmake_sh_makefile}"
+    echo "else" >> "${xmake_sh_makefile}"
+    echo "INSTALLDIR:=\$(PREFIX)" >> "${xmake_sh_makefile}"
     echo "endif" >> "${xmake_sh_makefile}"
     echo "" >> "${xmake_sh_makefile}"
     echo "ifeq (\$(INSTALLDIR),)" >> "${xmake_sh_makefile}"