Hi, I updated ppp-2.4.9 to ppp-2.5.0. I have may found an issue using pkg-config to find openssl includes and libs. After calling autogen.sh, we call configure with a lot of environment variables. PATH=... CC=... CFLAGS=... LDFLAGS=... PKG_CONFIG_PATH=PATH_TO_PKG_CONFIG_FILES configure --host=mips-34kc-linux-gnu --build=i486-linux-gnu As you can see we do cross-compilation and don't pass --with-openssl During configure, default ssl dirs are checked but no ssl.h file could be found. Btw. On cross-compile we should skip checking default locations. However the variable found is still false. Then we come to following if: if test "${with_openssl}" != "no" && test ! ${found} For some reason we don't go into the if condition to use pkg-config to get openssl includes and libs. I think the "test ! ${found}" should be changed to "test ${found} == false". "test ! ${somevar}" seems to be true, if somevar does not exists. It does not check the content of the variable. Here are some tests I made: foo=true if test ! ${foo} then : printf "%s\n" "in if test ! foo=true" >&6 fi if test ${foo} then : printf "%s\n" "in if test foo=true" >&6 fi foo=false if test ! ${foo} then : printf "%s\n" "in if test ! foo=false " >&6 fi if test ${foo} then : printf "%s\n" "in if test foo=false " >&6 fi if test ${foobarbaz} then : printf "%s\n" "in if test foobarbaz " >&6 fi if test ! ${foobarbaz} then : printf "%s\n" "in if test ! foobarbaz " >&6 fi On terminal I see following lines: in if test foo=true in if test foo=false in if test ! foobarbaz Therefore I propose following patch (based on tag ppp-2.5.0) --- a/m4/ax_check_openssl.m4 +++ b/m4/ax_check_openssl.m4 @@ -70,7 +70,7 @@ AC_DEFUN([AX_CHECK_OPENSSL], [ ]) done]) - AS_IF([test "${with_openssl}" != "no" && test ! ${found}], [ + AS_IF([test "${with_openssl}" != "no" && test ${found} == false], [ # if pkg-config is installed and openssl has installed a .pc file, # then use that information and don't search ssldirs AC_PATH_PROG([PKG_CONFIG], [pkg-config]) May you can check this. At the moment, we use autoconf version 2.72c If you need more details, don't hesitate to contact me. Best regards, Stefan Scheibner Software engineer