diff --git a/src/jgf.in b/src/jgf.in
index 7304a9ffc..4bd2c24f8 100644
--- a/src/jgf.in
+++ b/src/jgf.in
@@ -1,39 +1,39 @@
 #!/bin/sh
 
-prefix= @prefix@
-exec_prefix= @exec_prefix@
-GF_BIN_DIR= @bindir@
-GF_DATA_DIR= @datadir@/GF-@PACKAGE_VERSION@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+GF_BIN_DIR=@bindir@
+GF_DATA_DIR=@datadir@/GF-@PACKAGE_VERSION@
 
-JAVA= @JAVA@
+JAVA=@JAVA@
 
-GF= $GF_BIN_DIR/gf
-JARFILE= $GF_DATA_DIR/gf-java.jar
+GF=$GF_BIN_DIR/gf
+JARFILE=$GF_DATA_DIR/gf-java.jar
 
-if [ ! -x "$JAVA" ]; then
-    JAVA= `which java`
+if [ ! -x "${JAVA}" ]; then
+    JAVA=`which java`
 fi
 
-if [ ! -x "$JAVA" ]; then
+if [ ! -x "${JAVA}" ]; then
     echo "No Java VM found"
     exit 1
 fi
 
-if [ ! -f "$JARFILE" ]; then
-   echo "JAR file $JARFILE not found"
+if [ ! -f "${JARFILE}" ]; then
+   echo "JAR file ${JARFILE} not found"
    exit 1
 fi
 
-if [ ! -x "$GF" ]; then
-   GF= `which gf`
+if [ ! -x "${GF}" ]; then
+   GF=`which gf`
 fi
 
-if [ ! -x "$GF" ]; then
+if [ ! -x "${GF}" ]; then
     echo "gf not found"
     exit 1
 fi
 
-COMMAND= $JAVA -jar $JARFILE "$GF -java $*"
+COMMAND= ${JAVA} -jar ${JARFILE} "$GF -java $*"
 
-echo $COMMAND
-exec $COMMAND
+echo ${COMMAND}
+exec ${COMMAND}