I am not able to build csound on OS X anymore (using homebrew):

[ 72%] Building CXX object InOut/CMakeFiles/widgets.dir/widgets.cpp.o
cd /tmp/csound-ZQrY22/InOut && /usr/local/Library/ENV/4.3/clang++   -DCS_DEFAULT_PLUGINDIR=\"/Users/mesca/Library/Frameworks/CsoundLib64.framework/Versions/6.0/Resources/Opcodes64\" -DHAVE_SOCKETS -DHAVE_SPRINTF_L -DHAVE_STRTOD_L -DHAVE_STRTOK_R -DMACOSX -DNO_FLTK_THREADS -DPIPES -DUSE_LRINT -D_CSOUND_RELEASE_ -Dwidgets_EXPORTS -ffast-math -msse2 -fomit-frame-pointer -DHAVE_ATOMIC_BUILTIN -fPIC -I/usr/local/include -I/tmp/csound-ZQrY22/./H -I/tmp/csound-ZQrY22/./include -I/tmp/csound-ZQrY22/./Engine -I/tmp/csound-ZQrY22/. -I/tmp/csound-ZQrY22 -I/tmp/csound-ZQrY22/include -I/System/Library/Frameworks/CoreMIDI.framework/Headers -I/System/Library/Frameworks/AudioUnit.framework/Headers -I/tmp/csound-ZQrY22/InOut/. -I/usr/local/Cellar/fltk/1.3.2_1/include    -o CMakeFiles/widgets.dir/widgets.cp
 p.o -c /tmp/csound-ZQrY22/InOut/widgets.cpp
/tmp/csound-ZQrY22/InOut/widgets.cpp:2227:17: error: use of undeclared identifier 'vfork'
    pid_t pId = vfork();
                ^
/tmp/csound-ZQrY22/InOut/widgets.cpp:2243:9: error: use of undeclared identifier 'execvp'
        execvp(v[0], v);
        ^
/tmp/csound-ZQrY22/InOut/widgets.cpp:2246:7: error: use of undeclared identifier '_exit'
      _exit(0);
      ^
3 errors generated.
make[2]: *** [InOut/CMakeFiles/widgets.dir/widgets.cpp.o] Error 1
make[1]: *** [InOut/CMakeFiles/widgets.dir/all] Error 2


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