[Denemo-devel] Can not compile: fluid.h not found

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I'm on my laptop currently where I have not compiled Denemo for quite a
few time. It was without gtk sourceview here.

I used my normal automatic Arch-linux build script which compiles fresh
from git every time.
System ist Archlinux 32 bit, Configure is with JACK. Fluidsynth is
installed. Its nearly the same system as my desktop only different
hardware and 32bit version of arch linux.
Of course something has to be different.

Configure runs through but make halts on:

gcc -DHAVE_CONFIG_H -I. -I.. -I../intl -I../intl -I../include
-I../libsmf -I../pixmaps -DLOCALEDIR=\"/usr/share/locale\"
-DSYSCONFDIR=\"/etc/denemo/\" -DPKGDATADIR=\"/usr/share/denemo/\"
-DDATAROOTDIR=\"/usr/share/\" -DPKGNAME=\"denemo\"     -march=i686
-mtune=generic -O2 -pipe -I/usr/include/gtk-2.0
-I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo
-I/usr/include/pango-1.0 -I/usr/include/glib-2.0
-I/usr/lib/glib-2.0/include -I/usr/include/pixman-1
-I/usr/include/freetype2 -I/usr/include/libpng12     -pthread
-I/usr/include/aubio   -I/usr/include/libxml2    
-I/usr/include/gtksourceview-2.0 -I/usr/include/libxml2
-I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0
-I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/glib-2.0
-I/usr/lib/glib-2.0/include -I/usr/include/pixman-1
-I/usr/include/freetype2 -I/usr/include/libpng12     -D_HAVE_JACK_    
-MT main.o -MD -MP -MF .deps/main.Tpo -c -o main.o main.c
main.c:43:19: Error: fluid.h:File or Directory not found
make[2]: *** [main.o] Error 1