I am OK to compile 0.10.x but 0.11.x with following error configure: WARNING: *** *** autogen not found. Will not link against libopts. *** checking for sighandler_t... yes checking for sig_t... yes checking for __sighandler_t... yes checking for struct ucred... yes checking for struct iphdr.ihl... yes checking size of unsigned long... 8 checking whether byte ordering is bigendian... no checking for LIBNETTLE... no configure: error: Package requirements (nettle >= 2.7) were not met: No package 'nettle' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables LIBNETTLE_CFLAGS and LIBNETTLE_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details. ________________________________ **************************************** This E-Mail is confidential and intended only for the use of the individual/s or entity named above and may contain information that is privileged. If you are not the intended recipient, you are notified that any dissemination, distribution or copying of this E-Mail is strictly prohibited.If you have received this E-Mail in error, please notify us immediately by return E-Mail or telephone and destroy the original message. ****************************************