libstdc++3: fixed header location (#1212)

dev-libs/libsigc++/libsigc++3-2.99.8.recipe

@@ -8,7 +8,7 @@ has an ease of use unmatched by other C++ callback libraries."
 HOMEPAGE="http://libsigc.sourceforge.net/"
 COPYRIGHT="2002-2017 The libsigc++ Development Team"
 LICENSE="GNU LGPL v3"
-REVISION="1"
+REVISION="2"
 SOURCE_URI="http://ftp.gnome.org/pub/GNOME/sources/libsigc++/2.99/libsigc++-$portVersion.tar.xz"
 CHECKSUM_SHA256="1d053813a455bd9157b01312d015f74fa39f33466961a66e844daeaee658f0f1"
 SOURCE_DIR="libsigc++-$portVersion"
@@ -41,8 +41,12 @@ BUILD_REQUIRES="
 BUILD_PREREQUIRES="
 	cmd:autoconf
 	cmd:gcc$secondaryArchSuffix
+	cmd:grep
 	cmd:libtoolize$secondaryArchSuffix
 	cmd:make
+	cmd:perl
+	cmd:pkg_config$secondaryArchSuffix
+	cmd:xsltproc$secondaryArchSuffix
 "
 
 BUILD()
@@ -55,6 +59,9 @@ INSTALL()
 {
 	make install
 
+	mv $libDir/sigc++-3.0/include/sigc++config.h $includeDir/sigc++-3.0
+	rm -rf $libDir/sigc++-3.0
+
 	prepareInstalledDevelLib \
 		libsigc-3.0