diff --git a/libs/portaudio/Makefile.in b/libs/portaudio/Makefile.in
index e5c250207a..c1fd8fe00f 100644
--- a/libs/portaudio/Makefile.in
+++ b/libs/portaudio/Makefile.in
@@ -34,6 +34,7 @@ LT_RELEASE=@LT_RELEASE@
 LT_CURRENT=@LT_CURRENT@
 LT_REVISION=@LT_REVISION@
 LT_AGE=@LT_AGE@
+SHELL=@SHELL@
 
 OTHER_OBJS = @OTHER_OBJS@