First, make sure you have sigc++ installed.
Then type:
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
That will only stay for that terminal session, so dont exit that terminal until you are done installing the program.
Also, it may not be in that location, though thats the norm. do a:
su -c "updatedb"
locate "sigc++-1.2.pc"
Look for the directory that contains "pkgconfig".
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