diff -rupN tuxguitar-1.5.4-src.org/misc/tuxguitar.sh tuxguitar-1.5.4-src/misc/tuxguitar.sh
--- tuxguitar-1.5.4-src.org/misc/tuxguitar.sh	2020-05-12 13:46:29.000000000 -0400
+++ tuxguitar-1.5.4-src/misc/tuxguitar.sh	2021-10-30 14:21:17.810700369 -0400
@@ -116,21 +116,18 @@ env_()
     [ -z ${JAVA_HOME} ] && t=$(java_guess_) && [ -d "$t" ] && JAVA_HOME="$t"
     if [ -d "${JAVA_HOME}" ] ; then
         export JAVA_HOME
-        JAVA="${JAVA:=${JAVA_HOME}/jre/bin/java}"
+        JAVA="${JAVA:=${JAVA_HOME}/bin/java}"
         [ -x ${JAVA} ] && export JAVA
     else
         JAVA=${JAVA:=java}
         export JAVA
     fi
 
-# mozilla
-    [ -z ${MOZILLA_FIVE_HOME} ] \
-	&& t=$(mozilla_guess_) && [ -d "$t" ] && MOZILLA_FIVE_HOME="$t"
-    if [ -d "$MOZILLA_FIVE_HOME" ] ; then
-        export MOZILLA_FIVE_HOME
-        export LD_LIBRARY_PATH="$MOZILLA_FIVE_HOME"
-    else
-        echo '$MOZILLA_FIVE_HOME not valid : check doc shipped w/ tuxguitar'
+    # mozilla
+    if [ -z $MOZILLA_FIVE_HOME ]; then
+	MOZILLA_FIVE_HOME=/usr/lib64/firefox
+	[ ! -d ${MOZILLA_FIVE_HOME} ] && MOZILLA_FIVE_HOME=/usr/lib64/mozilla
+	[ ! -d ${MOZILLA_FIVE_HOME} ] && MOZILLA_FIVE_HOME=/usr/lib64/iceweasel
     fi
 
     [ ! -z ${DEBUG} ] && echo "# MOZILLA_FIVE_HOME=${MOZILLA_FIVE_HOME}"
@@ -141,10 +138,10 @@ env_()
 tuxguitar_()
 {
     local PACKAGE=${PACKAGE:=tuxguitar}
-    local PACKAGE_HOME=${PACKAGE_HOME:=/usr/share/${PACKAGE}/}
+    local PACKAGE_HOME=${PACKAGE_HOME:=/usr/share/java/${PACKAGE}/}
 #   local PACKAGE_MAIN=${PACKAGE_MAIN:=org.herac.tuxguitar.gui.TGMain}
     local PACKAGE_MAIN=${PACKAGE_MAIN:=org.herac.tuxguitar.app.TGMain}
-    local PACKAGE_LIB=${PACKAGE_LIB:=/usr/lib/jni}
+    local PACKAGE_LIB=${PACKAGE_LIB:=/usr/lib64/tuxguitar}
 # java env
     JAVA=${JAVA:=java}
     CLASSPATH=${CLASSPATH}
@@ -154,10 +151,76 @@ tuxguitar_()
     [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
     t="/usr/share/java/itext.jar"
     [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-alsa.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-ascii.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+#    t=${PACKAGE_HOME}/${PACKAGE}-awt-graphics.jar
+#    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-browser-ftp.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-community.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-compat.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-converter.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-editor-utils.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-fluidsynth.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-gervill.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-gm-settings.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-gm-utils.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-gpx.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-gtp.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-gtp-ui.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-image.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-jack.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-jack-ui.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-jsa.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-lib.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-lilypond.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-midi.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-musicxml.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-oss.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+#    t=${PACKAGE_HOME}/${PACKAGE}-pdf.jar
+#    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-ptb.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-svg.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-tef.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-tray.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-tuner.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-ui-toolkit.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-ui-toolkit-swt.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
+    t=${PACKAGE_HOME}/${PACKAGE}-viewer.jar
+    [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
     t=$(swt_guess_)
     [ -r "$t" ] && CLASSPATH=${CLASSPATH}:$t
 
-    JAVA_FLAGS=${JAVA_FLAGS:="-Xms128m -Xmx128m"}
+    JAVA_FLAGS=${JAVA_FLAGS:="-Xms128m -Xmx512m"}
     JAVA_FLAGS=" ${JAVA_FLAGS} \
         -Djava.library.path=${PACKAGE_LIB} \
         -D${PACKAGE}.share.path=/usr/share/${PACKAGE} \
@@ -170,6 +233,9 @@ tuxguitar_()
     [ ! -z ${DEBUG} ] && ${JAVA} -version
     [ ! -z ${DEBUG} ] && ${JAVA} ${JAVA_FLAGS} ${PACKAGE_MAIN} --version
 
+    SWT_GTK3=0
+    export SWT_GTK3
+
     ${JAVA} ${JAVA_FLAGS} ${PACKAGE_MAIN} $arg "$@"
 }