diff --git a/src/etc/install.sh b/src/etc/install.sh
index d8cc3d3a3f6..c949743ea75 100644
--- a/src/etc/install.sh
+++ b/src/etc/install.sh
@@ -293,11 +293,9 @@ elif [ "$CFG_OSTYPE" = "Darwin" ]
 then
     CFG_LD_PATH_VAR=DYLD_LIBRARY_PATH
     CFG_OLD_LD_PATH_VAR=$DYLD_LIBRARY_PATH
-    UNIX=1
 else
     CFG_LD_PATH_VAR=LD_LIBRARY_PATH
     CFG_OLD_LD_PATH_VAR=$LD_LIBRARY_PATH
-    UNIX=1
 fi
 
 flag uninstall "only uninstall from the installation prefix"
@@ -469,13 +467,13 @@ while read p; do
 done < "${CFG_SRC_DIR}/${CFG_LIBDIR_RELATIVE}/rustlib/manifest.in"
 
 # Run ldconfig to make dynamic libraries available to the linker
-if [ $UNIX -eq 1 ]
+if [ "$CFG_OSTYPE" = "Linux" ]
     then
     ldconfig
     if [ $? -ne 0 ]
     then
-	warn "failed to run ldconfig."
-	warn "this may happen when not installing as root, in which case you know what you are doing and it's probably fine."
+        warn "failed to run ldconfig."
+        warn "this may happen when not installing as root and may be fine"
     fi
 fi