audio/fmit: Fixed build when jack is not present.

Signed-off-by: Matteo Bernardini <ponce@slackbuilds.org>

audio/fmit/README

@@ -4,6 +4,6 @@ PortAudio for audio input. Features error and volume history, tuning scales
 using Scala (.scl) files, microtonal tuning, harmonic ratios, wave shapes, and
 more. 
 
-fmit will automatically detect ALSA and JACK, if present, and if OSS or
-PORTAUDIO support is desired, pass OSS="ON" or PORTAUDIO="ON" to the
-SlackBuild.
+fmit will automatically detect ALSA and if jack-audio-connection-kit, oss or
+portaudio support is desired, pass JACK="ON", OSS="ON" or PORTAUDIO="ON" to
+the SlackBuild.

audio/fmit/fmit.SlackBuild

@@ -28,6 +28,7 @@ BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}
 
 # To support OSS or PortAudio, pass OSS="ON" or PORTAUDIO="ON".
+JACK=${JACK:-OFF}
 OSS=${OSS:-OFF}
 PORTAUDIO=${PORTAUDIO:-OFF}
 
@@ -80,6 +81,7 @@ cd build
     -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
     -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
     -DCMAKE_INSTALL_PREFIX=/usr \
+    -DSOUNDSYSTEM_USE_JACK=$JACK \
     -DSOUNDSYSTEM_USE_OSS=$OSS \
     -DSOUNDSYSTEM_USE_PORTAUDIO=$PORTAUDIO \
     -DCMAKE_BUILD_TYPE=Release ..