System without gmp on it. [ebuild U ] dev-python/pycrypto-2.1.0 [2.0.1-r8] USE="-doc% -gmp (-bindist%) (-test%)" 0 kB ... warning: PCTBuildPy: byte-compiling is disabled, skipping. running build_ext building 'Crypto.PublicKey._fastmath' extension creating build-2.6/temp.linux-x86_64-2.6 creating build-2.6/temp.linux-x86_64-2.6/src x86_64-pc-linux-gnu-gcc -pthread -pipe -fno-inline-functions -fno-strict-aliasing -fPIC -O3 -fomit-frame-pointer -Isrc/ -I/usr/include/python2.6 -c src/_fastmath.c -o build-2.6/temp.linux-x86_64-2.6/src/_fastmath.o src/_fastmath.c:34:17: error: gmp.h: No such file or directory src/_fastmath.c:37: error: expected ')' before 'm' ... Portage 2.1.8.3 (default/linux/amd64/2008.0/server, gcc-4.1.2, glibc-2.6.1-r0, 2.6.28-hardened-r9-infra14 x86_64) ================================================================= System uname: Linux-2.6.28-hardened-r9-infra14-x86_64-AMD_Opteron-tm-_Processor_844-with-gentoo-1.12.11.1 Timestamp of tree: Wed, 28 Jul 2010 19:30:02 +0000 distcc 2.18.3 x86_64-pc-linux-gnu (protocols 1 and 2) (default port 3632) [disabled] ccache version 2.4 [disabled] app-shells/bash: 3.2_p33 dev-lang/python: 2.5.4-r3, 2.6.5-r2 dev-util/ccache: 2.4-r7 dev-util/cmake: 2.4.6-r1 sys-apps/baselayout: 1.12.11.1 sys-apps/sandbox: 1.6-r2 sys-devel/autoconf: 2.13, 2.65 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.1-r1, 1.11.1 sys-devel/binutils: 2.18-r3 sys-devel/gcc: 4.1.2 sys-devel/gcc-config: 1.4.0-r4 sys-devel/libtool: 2.2.6b virtual/os-headers: 2.6.23-r3 ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/udev/rules.d" CXXFLAGS="-O2 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="assume-digests distlocks fixpackages news parallel-fetch protect-owned sandbox sfperms strict unmerge-logs unmerge-orphans userfetch" GENTOO_MIRRORS="http://gentoo.osuosl.org" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j6" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" SYNC="rsync://bobolink.gentoo.org/gentoo-portage/" USE="acpi amd64 berkdb bzip2 crypt multilib ncurses nptl nptlonly pam perl python readline sqlite ssl unicode xml xml2 zlib" 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" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="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 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" ELIBC="glibc" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" RUBY_TARGETS="ruby18" USERLAND="GNU" VIDEO_CARDS="fbdev glint intel mach64 mga neomagic nv r128 radeon savage sis tdfx trident vesa via vmware voodoo" 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, EMERGE_DEFAULT_OPTS, FFLAGS, INSTALL_MASK, LANG, LC_ALL, LINGUAS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY
That version is gone, can't reproduce with newer, and gmp is a dependency of gcc and as such hard to remove ...