Patrick, thanks for your reply. Yes, I already installed that dev pkg. austin@austin-Studio:~/powertop/powertop-tset$ dpkg -L libnl3-dev | grep pkgconfig /usr/lib/pkgconfig /usr/lib/pkgconfig/libnl-3.0.pc austin@austin-Studio:~/powertop/powertop-tset$ cat /usr/lib/pkgconfig/libnl-3.0.pc prefix=/usr exec_prefix=${prefix} libdir=${exec_prefix}/lib includedir=${prefix}/include Name: libnl Description: Convenience library for netlink sockets Version: 3.0 Libs: -L${libdir} -lnl -lnl-route -lnl-nf -lnl-genl -lnl-cli Cflags: -I${includedir} austin@austin-Studio:~/powertop/powertop-tset$ And I also tried to uninstall libnl3-dev, and re-install libnl2-dev, same issue. PKG_CHECK_MODULES([LIBNL], [libnl-3.0 libnl-genl-3.0], [ <=== when with libnl-3.0.pc, the logic should fall into the following has_libnl_ver=3, but seemed not; has_libnl_ver=3], [ AC_SEARCH_LIBS([nl_socket_alloc], [nl-3 nl-genl-3], [ <=== I also change the nl3 to nl, and remove nl-genl-3, but it cannot find nl_socket_alloc, because this function is from bl2 and 3, so it seemed the system doesn't try to find this function from /usr/lib/libnl.so at all, has_libnl_ver=3], [ AC_SEARCH_LIBS([nl_socket_alloc], [nl], [ <===same case like above has_libnl_ver=2], [ PKG_CHECK_MODULES([LIBNL], [libnl-1], [has_libnl_ver=1], [])])])]) <=== finally, fall into here, but because I don't have libnl v1, so fail to work. 2012/11/1 Patrick McCarty <patrick.mccarty(a)linux.intel.com&gt; > On Wed, Oct 31, 2012 at 10:11:13PM +0800, Austin Zhang wrote: > > Hi, > > > > I am trying to compile powertop on my box: ubuntu 12.04, X86-64. > > > > (1)compiling issue > > > > Here, my system didn’t install libnl-1, but I installed libnl2 (under > /usr/lib) > > and libnl-3 (under /lib). > > > > Then when ‘./configure’, I got: > > > > checking for LIBNL... no > > > > configure: error: Package requirements (libnl-1) were not met: > > > > No package 'libnl-1' found > > > > so seemed the below logic in configure.ac doesn’t work > > > > …… > > > > has_libnl_ver=0 > > > > PKG_CHECK_MODULES([LIBNL], [libnl-3.0 libnl-genl-3.0], [ > > > > has_libnl_ver=3], [ > > > > AC_SEARCH_LIBS([nl_socket_alloc], [nl-3 nl-genl-3], [ > > > > has_libnl_ver=3], [ > > > > AC_SEARCH_LIBS([nl_socket_alloc], [nl], [ > > > > has_libnl_ver=2], [ > > > > PKG_CHECK_MODULES([LIBNL], [libnl-1], > [has_libnl_ver= > > 1], [])])])]) > > > > …… > > Based on the file lists you sent in a followup post, it appears that > Ubuntu uses a different naming convention for these libraries, so > AC_SEARCH_LIBS will not find the function it needs in either libnl-3 or > libnl-genl-3, since they don't exist. > > Is there a -devel package you can install that provides a pkgconfig > file for libnl-3? > > -Patrick >