diff -ru ltrace-0.5.3.org/configure ltrace-0.5.3/configure
--- ltrace-0.5.3.org/configure	2011-08-21 18:55:15.000000000 +0200
+++ ltrace-0.5.3/configure	2011-08-21 18:54:46.000000000 +0200
@@ -15,8 +15,12 @@
 echo $PACKAGE_VERSION
 
 echo -n "checking HOST_OS... "
-HOST_OS=$( uname -s )
-if [ "$HOST_OS" = "Linux" ]
+if [ -z "$HOST_OS" ] ; then
+  HOST_OS=$( uname -s )
+else
+  echo -n "using preset: "
+fi
+if [ "$HOST_OS" = "Linux" -o "$HOST_OS" = "linux" ]
 then
   HOST_OS="linux-gnu"
 fi
