In media-libs/glew-1.10.0 the portage DESTDIR is prefixed to the paths (prefix, exec_prefix, libdir and includedir) in glew's pkg-config file. This will cause any program that gets include and link paths from pkg-config to possibly fail to compile. $ emerge =media-libs/glew-1.10.0 $ cat /usr/lib/pkgconfig/glew.pc prefix=/var/tmp/portage/media-libs/glew-1.10.0/image//usr exec_prefix=/var/tmp/portage/media-libs/glew-1.10.0/image//usr/bin libdir=/var/tmp/portage/media-libs/glew-1.10.0/image//usr/lib64 includedir=/var/tmp/portage/media-libs/glew-1.10.0/image//usr/include/GL Name: glew Description: The OpenGL Extension Wrangler library Version: 1.10.0 Cflags: -I${includedir} Libs: -L${libdir} -lGLEW Requires: glu $ emerge =media-libs/glew-1.9.0 $ cat /usr/lib/pkgconfig/glew.pc prefix=/usr exec_prefix=/usr/bin libdir=/usr/lib includedir=/usr/include/GL Name: glew Description: The OpenGL Extension Wrangler library Version: 1.9.0 Cflags: -I${includedir} Libs: -L${libdir} -lGLEW Reproducible: Always Steps to Reproduce: 1. emerge =media-libs/glew-1.10.0 2. echo -e '#include <glew.h>\nint main { return 0; }' > test-glew.c 3. gcc $(pkg-config --libs --cflags glew) test-glew.c Actual Results: $ gcc $(pkg-config --libs --cflags glew) test-glew.c test-glew.c:1:18: fatal error: glew.h: No such file or directory compilation terminated. Expected Results: What happens with glew-1.9.0 $ gcc $(pkg-config --libs --cflags glew) test-glew.c $ ./a.out $ emerge --info Portage 2.2.0_alpha188 (default/linux/amd64/13.0/desktop/kde, gcc-4.7.3, glibc-2.17, 3.9.7-ck.1 x86_64) ================================================================= System uname: Linux-3.9.7-ck.1-x86_64-Intel-R-_Core-TM-2_Quad_CPU_Q9300_@_2.50GHz-with-gentoo-2.2 KiB Mem: 8179904 total, 1793460 free KiB Swap: 4194296 total, 3312276 free Timestamp of tree: Tue, 23 Jul 2013 15:30:01 +0000 ld GNU ld (GNU Binutils) 2.23.1 distcc 3.1 x86_64-pc-linux-gnu [disabled] ccache version 3.1.9 [enabled] app-shells/bash: 4.2_p45 dev-java/java-config: 2.2.0 dev-lang/python: 2.7.5-r1, 3.2.5-r1, 3.3.2-r1 dev-util/ccache: 3.1.9 dev-util/cmake: 2.8.11.1 dev-util/pkgconfig: 0.28 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.11.8 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.4_p6-r1, 1.11.6, 1.12.6, 1.14 sys-devel/binutils: 2.23.1 sys-devel/gcc: 4.6.4, 4.7.3 sys-devel/gcc-config: 1.8 sys-devel/libtool: 2.4.2 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.9 (virtual/os-headers) sys-libs/glibc: 2.17 Repositories: gentoo x-portage x-dolphin-emu Folding-Home forked-daapd x-hawkthorne x-hdhomerun msp430 mupen64plus partclone sage-on-gentoo sunrise steam-overlay x-xiph ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA dlj-1.1 PUEL AdobeFlash-11.x skype-4.0.0.7-copyright google-chrome Oracle-BCLA-JavaSE FAH-EULA-2009" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=core2 -O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/themes/oxygen-gtk/gtk-2.0 /usr/share/themes/oxygen-gtk/gtk-3.0 /var/lib/hsqldb" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.5/ext-active/ /etc/php/cgi-php5.5/ext-active/ /etc/php/cli-php5.5/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/splash /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c" CXXFLAGS="-march=core2 -O2 -pipe" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--nospinner --keep-going" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs ccache config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://gentoo.llarian.net/ http://lug.mtu.edu/gentoo/ http://mirror.mcs.anl.gov/pub/gentoo/" LANG="en_US.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j4" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage /usr/local/overlays/dolphin-emu /usr/local/overlays/fah /usr/local/overlays/forked-daapd /usr/local/overlays/hawkthorne /usr/local/overlays/hdhomerun /usr/local/overlays/msp430-overlay /usr/local/overlays/mupen /usr/local/overlays/partclone /usr/local/overlays/sage-on-gentoo /usr/local/overlays/sunrise-reviewed /usr/local/overlays/steam-overlay /usr/local/overlays/xiph" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="X a52 aac aacs acl acpi alsa amd64 amr amrnb amrwb avahi bash-completion berkdb bluray bzip2 cairo cdda cdr cec cli consolekit cracklib crypt cxx dbus declarative dirac dri dts dvb dvd dvdr emboss encode exif fam fbcondecor ffmpeg fftw flac fltk fortran gdbm gif gphoto2 gpm gstreamer gtk htmlhandbook iconv ieee1394 inotify ios ipv6 java jpeg kde kerberos kipi kvm lapack lcms libass libnotify libv4l2 lirc live lm_sensors lzma lzo mad matroska mdadm mmap mmx mmxext mng modules mp3 mp4 mpeg mudflap multilib musicbrainz mythtv ncurses nls nptl ntfs ogg opencl openexr opengl openmp openssl opus pam pango pcre pdf phonon plasma png policykit ppds qt3support qt4 qwt rar readline real redland rtmp samba schroedinger sdl semantic-desktop session spell sqlite sqlite3 srt sse sse2 sse3 sse4 sse4_1 ssl ssse3 startup-notification subversion svg tcpd theora threads thumbnail tiff truetype udev udisks unicode upower usb v4l2 vaapi vdpau vnc vorbis vpx webkit wxwidgets x264 xattr xcb xcomposite xinerama xml xscreensaver xulrunner xv xvid xvmc zeroconf zip zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" INPUT_DEVICES="evdev keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en en_US" LIRC_DEVICES="inputlirc" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-4" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2" QEMU_SOFTMMU_TARGETS="i386 x86_64" QEMU_USER_TARGETS="i386 x86_64" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="radeon r600 nouveau nvidia" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CPPFLAGS, CTARGET, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
https://sourceforge.net/p/glew/patches/41/ https://github.com/nigels-com/glew/pull/1
Fixed in 1.10.0-r1.
upstream has merged the pull request which means the next release will respect DESTDIR variable
