I tried to compile on cygwin. The following error appeared:
libtool: compile: g++ -DHAVE_CONFIG_H -I. -I../../libinterp -I.. -I../../liboctave/cruft/misc -I../../liboctave/array -I../liboctave/numeric -I../../liboctave/numeric -I../liboctave/operators -I../../liboctave/operators -I../../liboctave/system -I../../liboctave/util -I../../libinterp/octave-value -I../../libinterp/operators -Iparse-tree -I../../libinterp/parse-tree -Iinterp-core -I../../libinterp/interp-core -Iinterpfcn -I../../libinterp/interpfcn -Icorefcn -I../libgnu -I../../libgnu -mieee-fp -I/usr/include/freetype2 -Wall -W -Wshadow -Wold-style-cast -Wformat -Wpointer-arith -Wwrite-strings -Wcast-align -Wcast-qual -g -O2 -MT interpfcn/interpfcn_libinterpfcn_la-graphics.lo -MD -MP -MF interpfcn/.deps/interpfcn_libinterpfcn_la-graphics.Tpo -c ../../libinterp/interpfcn/graphics.cc -DDLL_EXPORT -DPIC -o interpfcn/.libs/interpfcn_libinterpfcn_la-graphics.o
../../libinterp/interpfcn/graphics.cc: In member function 'int gh_manager::do_process_events(bool)':
../../libinterp/interpfcn/graphics.cc:8206:17: error: 'Fdrawnow' was not declared in this scope
Makefile:5795: recipe for target `interpfcn/interpfcn_libinterpfcn_la-graphics.lo' failed
make[3]: *** [interpfcn/interpfcn_libinterpfcn_la-graphics.lo] Error 1
make[3]: Leaving directory `/home/hous/workspace/octave/build/libinterp'
Makefile:3409: recipe for target `all' failed
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/hous/workspace/octave/build/libinterp'
Makefile:1952: recipe for target `all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/hous/workspace/octave/build'
Makefile:1840: recipe for target `all' failed
make: *** [all] Error 2
It was building fine befor, so its not an dependency issue.