Source of libopenssl.m4 - Zabbix

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    [
      if test "$withval" = "no"; then
        want_openssl="no"
        _libopenssl_dir="no"
      elif test "$withval" = "yes"; then
        want_openssl="yes"
        _libopenssl_dir="no"
      else
        want_openssl="yes"
        _libopenssl_dir=$withval
        _libopenssl_dir_lib="$withval/lib"
        if test -d $withval/lib64; then
          _libopenssl_dir_lib=$withval/lib64
        elif test -d $withval/lib/64; then
          _libopenssl_dir_lib=$withval/lib/64
        else
          _libopenssl_dir_lib=$withval/lib
        fi
      fi
      accept_openssl_version="no"
      mt_required=$2
    ],[want_openssl=ifelse([$1],,[no],[$1])]
  )
​
  if test "x$want_openssl" = "xyes"; then
​
    if test "x$enable_static_libs" = "xyes"; then
        test "x$static_linking_support" = "xno" -a -z "$_libopenssl_dir_lib" && AC_MSG_ERROR(["OpenSSL: Compiler not support statically linked libs from default folders"])
        AC_REQUIRE([PKG_PROG_PKG_CONFIG])
        m4_ifdef([PKG_PROG_PKG_CONFIG], [PKG_PROG_PKG_CONFIG()], [:])
        test -z "$PKG_CONFIG" -a -z "$_libopenssl_dir_lib" && AC_MSG_ERROR([Not found pkg-config library])
        _libopenssl_dir_lib_64="$_libopenssl_dir_lib/64"
        test -d "$_libopenssl_dir_lib_64" && _libopenssl_dir_lib="$_libopenssl_dir_lib_64"
        m4_pattern_allow([^PKG_CONFIG_LIBDIR$])
    fi
​
     AC_MSG_CHECKING(for OpenSSL support)
     if test "x$_libopenssl_dir" = "xno"; then      # if OpenSSL directory is not specified
       if test -f /usr/local/include/openssl/ssl.h -a -f /usr/local/include/openssl/crypto.h; then
         OPENSSL_CFLAGS=-I/usr/local/include
         OPENSSL_LDFLAGS=-L/usr/local/lib
         OPENSSL_LIBS="-lssl -lcrypto"
         found_openssl="yes"
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         OPENSSL_LIBS="-lssl -lcrypto"
         found_openssl="yes"
         LIBOPENSSL_ACCEPT_VERSION([/usr/include/openssl/opensslv.h], [$mt_required])
       else                     # libraries are not found in default directories
         found_openssl="no"
         AC_MSG_RESULT(no)
       fi
     else                       # search in the specified OpenSSL directory
       if test -f $_libopenssl_dir/include/openssl/ssl.h -a -f $_libopenssl_dir/include/openssl/crypto.h; then
         OPENSSL_CFLAGS=-I$_libopenssl_dir/include
​
         if test -d $_libopenssl_dir/lib64; then
           OPENSSL_LDFLAGS=-L$_libopenssl_dir/lib64
         elif test -d $_libopenssl_dir/lib/64; then
           OPENSSL_LDFLAGS=-L$_libopenssl_dir/lib/64
         else
           OPENSSL_LDFLAGS=-L$_libopenssl_dir/lib
         fi
​
         OPENSSL_LDFLAGS=-L$_libopenssl_dir_lib
         OPENSSL_LIBS="-lssl -lcrypto"
         found_openssl="yes"
         LIBOPENSSL_ACCEPT_VERSION([$_libopenssl_dir/include/openssl/opensslv.h], [$mt_required])
       else                     # libraries are not found in specified directories
         found_openssl="no"
         AC_MSG_RESULT(no)
       fi
     fi
  fi
​