Make fltk optional

Signed-off-by: falkTX <falktx@falktx.com>

meson.build

@@ -24,8 +24,8 @@ threaddep = dependency('threads')
 jackdep = dependency('jack') #and not 'libjack'
 
 cc = meson.get_compiler('c')
-fluid = find_program('fluid')
-fltkdep = cc.find_library('fltk', required: true)
+fluid = find_program('fluid', required: false)
+fltkdep = cc.find_library('fltk', required: false)
 
 executable('jackpatch',
     'src/jackpatch.c',
@@ -33,40 +33,42 @@ executable('jackpatch',
     install: true,
     )
 
-executable('non-session-manager',
-    sources: ['src/session-manager.cpp', 'src/debug.cpp', 'src/Endpoint.cpp', 'src/Thread.cpp', 'src/FL/Fl_Scalepack.C'],
-    dependencies: [fltkdep, liblodep, threaddep],
-    install: true,
-    )
-
 executable('nsm-proxy',
     sources: ['src/nsm-proxy.cpp', 'src/debug.cpp'],
     dependencies: [liblodep, threaddep],
     install: true,
     )
 
-NSM_Proxy_UI_cpp = custom_target(
-    'NSM_Proxy_UI.cpp',
-    output : 'NSM_Proxy_UI.C',
-    input : 'src/NSM_Proxy_UI.fl',
-    command : [fluid, '-c', '-o', '@OUTPUT@', '@INPUT@'],
-)
-
-NSM_Proxy_UI_h = custom_target(
-    'NSM_Proxy_UI.h',
-    output : 'NSM_Proxy_UI.H',
-    input : 'src/NSM_Proxy_UI.fl',
-    command : [fluid, '-c', '-h', '@OUTPUT@', '@INPUT@'],
-)
-
-executable('nsm-proxy-gui',
-    sources: ['src/nsm-proxy-gui.cpp', [NSM_Proxy_UI_cpp, NSM_Proxy_UI_h]],
-    dependencies: [fltkdep, liblodep, threaddep],
-    install: true,
-    )
-
 executable('nsmd',
     sources: ['src/nsmd.cpp', 'src/debug.cpp', 'src/Endpoint.cpp', 'src/file.cpp', 'src/Thread.cpp'],
     dependencies: [liblodep, threaddep],
     install: true,
     )
+
+if fluid.found() and fltkdep.found()
+    NSM_Proxy_UI_cpp = custom_target(
+        'NSM_Proxy_UI.cpp',
+        output : 'NSM_Proxy_UI.C',
+        input : 'src/NSM_Proxy_UI.fl',
+        command : [fluid, '-c', '-o', '@OUTPUT@', '@INPUT@'],
+    )
+
+    NSM_Proxy_UI_h = custom_target(
+        'NSM_Proxy_UI.h',
+        output : 'NSM_Proxy_UI.H',
+        input : 'src/NSM_Proxy_UI.fl',
+        command : [fluid, '-c', '-h', '@OUTPUT@', '@INPUT@'],
+    )
+
+    executable('non-session-manager',
+        sources: ['src/session-manager.cpp', 'src/debug.cpp', 'src/Endpoint.cpp', 'src/Thread.cpp', 'src/FL/Fl_Scalepack.C'],
+        dependencies: [fltkdep, liblodep, threaddep],
+        install: true,
+        )
+
+    executable('nsm-proxy-gui',
+        sources: ['src/nsm-proxy-gui.cpp', [NSM_Proxy_UI_cpp, NSM_Proxy_UI_h]],
+        dependencies: [fltkdep, liblodep, threaddep],
+        install: true,
+        )
+endif