You receive this bug because this package does not respect my system's CXX ( x86_64-pc-linux-gnu-g++ - /usr/bin/x86_64-pc-linux-gnu-g++ ) and calls directly g++ -/usr/bin/g++ The possible solutions to fix this issue are: 1)Fix the buildsystem, if you can 2)inherit toolchain-funcs and use tc-export CXX 3)inherit toolchain-funcs and use emake CXX="$(tc-getCXX)" c++ -DHAVE_CONFIG_H -I. -I.. -I../term -I../term -DBINDIR=\"/usr/bin\" -DX11_DRIVER_DIR=\"/usr/libexec/gnuplot/4.6\" -DQT_DRIVER_DIR=\"/usr/libexec/gnuplot/4.6\" -DGNUPLOT_SHARE_DIR=\"/usr/share/gnuplot/4.6\" -DGNUPLOT_PS_DIR=\"/usr/share/gnuplot/4.6/PostScript\" -DGNUPLOT_JS_DIR=\"/usr/share/gnuplot/4.6/js\" -DGNUPLOT_LUA_DIR=\"/usr/share/gnuplot/4.6/lua\" -DCONTACT=\"gnuplot-bugs@lists.sourceforge.net\" -DHELPFILE=\"/usr/share/gnuplot/4.6/gnuplot.gih\" -DGNUPLOT_X11=\"`echo gnuplot_x11 | sed 's,x,x,'`\" -DXAPPLRESDIR=\"/etc/X11/app-defaults/\" -DQTGNUPLOT_DATA_DIR=\"/usr/share/gnuplot/4.6/qt\" -I/usr/include -DQT_SHARED -I/usr/include/qt4 -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtSvg -march=native -O2 -pipe -c -o qt_term.o `test -f 'qtterminal/qt_term.cpp' || echo './'`qtterminal/qt_term.cpp
This is a regression from gnuplot 4.4. Can you also report it upstream, please?
Fixed without revbump in gnuplot-4.6.1.