diff --git a/polymer/eduke32/build/src/util/checkdefs.sh b/polymer/eduke32/build/src/util/checkdefs.sh
new file mode 100755
index 000000000..0fa4e122d
--- /dev/null
+++ b/polymer/eduke32/build/src/util/checkdefs.sh
@@ -0,0 +1,47 @@
+#!/bin/bash
+
+if [ -z "$1" ]; then
+    echo 'Usage: checkdefs.sh <some.def> [[<some_dir>] -patch]'
+fi
+deffn="$1"
+
+if [ -z "$2" ]; then
+    thedir=.
+else
+    thedir="$2"
+fi
+
+if [ -n "$3" ]; then
+    if [ "$3" != "-patch" ]; then
+        echo 'Usage: checkdefs.sh <some.def> [[<some_dir>] -patch]'
+    fi
+fi
+
+files=$(grep -E "\".*\..*\"" "$deffn" | sed 's/.*"\(.*\..*\)".*/\1/g')
+
+exfiles=$(find "$thedir" -type f)
+
+sedcmd=""
+
+for i in $files; do
+    fn="$thedir/$i"
+    if [ ! -f "$fn" ]; then
+        # try finding a matching file
+        match=$(echo "$exfiles" | grep -i "^$fn$")
+
+        if [ -z "$match" ]; then
+            echo "$fn"
+        else
+            echo "$fn --> $match"
+            sedcmd="$sedcmd;s|\"$i\"|\"${match#$thedir/}\"|g"
+        fi
+    fi
+done
+
+if [ -n "$3" ]; then
+    if [ -n "$sedcmd" ]; then
+        echo "Patching $deffn"
+#        echo "$sedcmd"
+        sed -i "$sedcmd" "$deffn"
+    fi
+fi