build: make sdl2 and rototiller bin optional

Now that there's a decoupled libtil usable by alternative
frontends by vendoring rototiller, the build should support
fb-less rototiller-less configurations.

In lieu of this change glimmer's build requires sdl2 despite not
actually utilizing sdl_fb.  Now that shouldn't be necessary,
should there be neither libdrm or sdl2 present we'll only produce
libtil and no rototiller binary at all.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 6ca1d77..aa42c08 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -5,9 +5,14 @@ libtil_la_SOURCES = til_args.c til_args.h til_fb.c til_fb.h til_knobs.h til.c ti
 libtil_la_CPPFLAGS = -I@top_srcdir@/src
 libtil_la_LIBADD = modules/compose/libcompose.la modules/drizzle/libdrizzle.la modules/flui2d/libflui2d.la modules/julia/libjulia.la modules/meta2d/libmeta2d.la modules/montage/libmontage.la modules/pixbounce/libpixbounce.la modules/plasma/libplasma.la modules/plato/libplato.la modules/ray/libray.la modules/roto/libroto.la modules/rtv/librtv.la modules/snow/libsnow.la modules/sparkler/libsparkler.la modules/spiro/libspiro.la modules/stars/libstars.la modules/submit/libsubmit.la modules/swab/libswab.la modules/swarm/libswarm.la libs/grid/libgrid.la libs/puddle/libpuddle.la libs/ray/libray.la libs/sig/libsig.la libs/txt/libtxt.la libs/ascii/libascii.la libs/din/libdin.la
 
+if ENABLE_ROTOTILLER
 bin_PROGRAMS = rototiller
-rototiller_SOURCES = fps.c fps.h main.c sdl_fb.c setup.h setup.c til.h til_fb.c til_fb.h til_knobs.h til_settings.c til_settings.h til_threads.c til_threads.h til_util.c til_util.h
+rototiller_SOURCES = fps.c fps.h main.c setup.h setup.c til.h til_fb.c til_fb.h til_knobs.h til_settings.c til_settings.h til_threads.c til_threads.h til_util.c til_util.h
+if ENABLE_SDL
+rototiller_SOURCES += sdl_fb.c
+endif
 if ENABLE_DRM
 rototiller_SOURCES += drm_fb.c
 endif
 rototiller_LDADD = libtil.la -lm
+endif