Attempt to build AppImage with Carla support

.travis/linux..install.sh

@@ -21,3 +21,11 @@ fi
 
 # shellcheck disable=SC2086
 sudo apt-get install -y $PACKAGES
+
+# Carla depends on kxstudio which creates some package conflicts (wine, etc)
+# If run too early in the dependency process.  Once provided by PPA, "carla-git"
+# can simply be added to $PACKAGES
+sudo apt-get install -y apt-transport-https software-properties-common wget
+wget https://launchpad.net/~kxstudio-debian/+archive/kxstudio/+files/kxstudio-repos_9.4.6~kxstudio1_all.deb
+sudo dpkg -i kxstudio-repos_9.4.6~kxstudio1_all.deb
+sudo apt-get install -y carla-git

cmake/linux/package_linux.sh.in

@@ -178,6 +178,16 @@ if [ -e "${APPDIR}/usr/lib/libjack.so.0" ]; then
    ln -sr "${APPDIR}usr/lib/lmms/optional/libweakjack.so" "${APPDIR}usr/lib/lmms/optional/libjack.so.0"
 fi
 
+# Use system-provided Carla files
+CARLABIN="/usr/share/carla/resources"
+if [ -d "${CARLABIN}" ]; then
+   rm -f "${APPDIR}/usr/lib/libcarla*.so"
+   mkdir -p "${APPDIR}${CARLABIN}"
+   ln -sf "${CARLABIN}/carla-plugin" "${APPDIR}${CARLABIN}/carla-plugin"
+   ln -sf "${CARLABIN}/carla-plugin-patchbay" "${APPDIR}${CARLABIN}/carla-plugin-patchbay"
+fi
+
+
 # Create AppImage
 echo -e "\nFinishing the AppImage..."
 echo -e "\n\n>>>>> appimagetool" >> "$LOGFILE"

plugins/carlabase/carla.cpp

@@ -154,7 +154,7 @@ CarlaInstrument::CarlaInstrument(InstrumentTrack* const instrumentTrack, const D
     QString dllName(carla_get_library_filename());
 
 #if defined(CARLA_OS_LINUX)
-    fHost.resourceDir = strdup(QString(dllName.split("/lib/carla")[0] + "/share/carla/resources/").toUtf8().constData());
+    fHost.resourceDir = strdup(QString(dllName.split("/lib")[0] + "/share/carla/resources/").toUtf8().constData());
 #else
     fHost.resourceDir = NULL;
 #endif