introspection linking

Linking C executable darktable
/usr/bin/cc   -std=c99 -fopenmp -Wall -fno-strict-aliasing -pthread -march=native -msse3 -g -mfpmath=sse -Werror -Werror=type-limits -O3 -DNDEBUG -O3 -ffast-math -fno-finite-math-only -fexpensive-optimizations    CMakeFiles/darktable.dir/main.c.o  -o darktable -rdynamic libdarktable.so external/rawspeed/librawspeed.a external/LuaAutoC/liblautoc.a -lgtk-3 -lgdk-3 -lpango-1.0 -lcairo -lgdk_pixbuf-2.0 -latk-1.0 -lxml2 -lsoup-2.4 -lgio-2.0 -lgobject-2.0 -lglib-2.0 -lgphoto2 -lgphoto2_port -lIlmImf -lImath -lIex -lIlmThread -llensfun -lgio-2.0 -lglib-2.0 -lgthread-2.0 -lgmodule-2.0 -lpangocairo-1.0 -lpthread -lrsvg-2 -lsqlite3 -lcurl -lpng -lz -ljpeg -ltiff -llcms2 -ljson-glib-1.0 -lexiv2 -lflickcurl -llua5.2 -lcolord -lcolordprivate -lgio-2.0 -lgobject-2.0 -lglib-2.0 -lcolord-gtk -lcolord -lcolordprivate -lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0 -lgtk-3 -lgdk-3 -lpango-1.0 -latk-1.0 -lxml2 -lsoup-2.4 -lgphoto2 -lgphoto2_port -lIlmImf -lImath -lIex -lIlmThread -llensfun -lgthread-2.0 -lgmodule-2.0 -lpangocairo-1.0 -lpthread -lrsvg-2 -lsqlite3 -lcurl -lpng -lz -ljpeg -ltiff -llcms2 -ljson-glib-1.0 -lexiv2 -lflickcurl -llua5.2 -lcolord -lcolordprivate -lcolord-gtk -lcairo-gobject -Wl,-rpath,/home/rwh/wd/darktable/build/src:
libdarktable.so: undefined reference to `dt_exposure_get_black'
collect2: error: ld returned 1 exit status
src/CMakeFiles/darktable.dir/build.make:177: recipe for target 'src/darktable' failed
make[2]: *** [src/darktable] Error 1
CMakeFiles/Makefile2:1106: recipe for target 'src/CMakeFiles/darktable.dir/all' failed
make[1]: *** [src/CMakeFiles/darktable.dir/all] Error 2
Makefile:137: recipe for target 'all' failed
make: *** [all] Error 2