[CinePaint] Compilation problem: undefined reference to pthread_mutex_trylock

Hello all,

I have a problem compiling CinePaint on Slackintosh (Slackware-Linux 12.1 on PowerPC G4).

Compilation stops with the following linker error:
g++ -O2 -o .libs/bracketing_to_hdr bracketing_to_hdr.o  ../../lib/.libs/libcinepaint.so /usr/lib/libgtk-x11-2.0.so /usr/lib/libgdk-x11-2.0.so /usr/lib/libatk-1.0.so /usr/lib/libgdk_pixbuf-2.0.so /usr/lib/libpangocairo-1.0.so /usr/lib/libpangoft2-1.0.so /usr/lib/libpango-1.0.so /usr/lib/libcairo.so /usr/lib/libfontconfig.so /usr/lib/libfreetype.so /usr/lib/libexpat.so -lpng12 /usr/lib/libXrender.so /usr/lib/libgobject-2.0.so /usr/lib/libgmodule-2.0.so /usr/lib/libglib-2.0.so /tmp/tgz/cinepaint-0.22-1/libhalf/.libs/libcinepaintHalf.so -L/usr/powerpc-slackware-linux/bin -L/usr/powerpc-slackware-linux/lib
-L/usr/lib/gcc/powerpc-slackware-linux/../../../powerpc-slackware-linux/lib
-L/usr/lib/gcc/powerpc-slackware-linux/../.. ./br_core/.libs/libbr_core.a ./FL_adds/.libs/libfl_adds.a -L/usr/local/lib ./gui/.libs/libgui.a /tmp/tgz/cinepaint-0.22-1/lib/fl_i18n/.libs/libcinepaint_fl_i18n.so -lgcc_s ../../lib/fl_i18n/.libs/libcinepaint_fl_i18n.so /usr/lib/libstdc++.so -lfltk_images -lpng -lz -ljpeg -lfltk
-lm /usr/lib/libXext.so /usr/lib/libX11.so /usr/lib/libxcb-xlib.so /usr/lib/libxcb.so /usr/lib/libXau.so /usr/lib/libXdmcp.so -ldl -lc /tmp/tgz/cinepaint-0.22-1/lib/fl_i18n/.libs/libcinepaint_fl_i18n.so:
undefined reference to `pthread_mutex_trylock'
collect2: ld returned 1 exit
status make[3]: *** [bracketing_to_hdr] Error 1 make[3]: Leaving directory
`/tmp/tgz/cinepaint-0.22-1/plug-ins/bracketing_to_hdr'

I used the following configure options:
./configure --enable-gtk2 --disable-static

FLTK 1.1.9 is installed with the following options:
./configure --enable-shared --enable-threads --enable-xinerama

I would be grateful for any suggestions.

TIA

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