g++ -DHAVE_CONFIG_H -I. -I. -I.. -I../include -I/usr/X11R6/include -g -O2 -MT libdtk_la-button.lo -MD -MP -MF .deps/libdtk_la-button.Tpo -c button.cpp  -fPIC -o .libs/libdtk_la-button.o
In file included from ../include/dtk_skin.h:7,
                 from button.cpp:9:
../include/skin_interface.h:6:21: X11/xpm.h: No such file or directory
button.cpp: In member function `virtual int Button::HandleKeyRelease(XEvent*)':
button.cpp:276: error: `XLookupString' undeclared (first use this function)
button.cpp:276: error: (Each undeclared identifier is reported only once for
   each function it appears in.)
make[2]: *** [libdtk_la-button.lo] Error 1
make[2]: Leaving directory `/home/goomez/devsec-3.0.5/dtk/lib'
make[1]: *** [install-recursive] Error 1
make[1]: Leaving directory `/home/goomez/devsec-3.0.5/dtk'
make: *** [install-recursive] Error 1