Force linux-style versioning when generating shared libraries on
Gentoo/FreeBSD hosts only.

Patch by Diego Elio Pettenò

http://bugs.gentoo.org/109105

--- a/m4/libtool.m4
+++ b/m4/libtool.m4
@@ -2666,7 +2666,14 @@
     *) objformat=elf ;;
     esac
   fi
-  version_type=freebsd-$objformat
+  # Handle Gentoo/FreeBSD as it was Linux
+  case $host_vendor in
+    gentoo)
+      version_type=linux ;;
+    *)
+      version_type=freebsd-$objformat ;;
+  esac
+
   case $version_type in
     freebsd-elf*)
       library_names_spec='$libname$release$shared_ext$versuffix $libname$release$shared_ext$major $libname$shared_ext'
@@ -2678,6 +2685,12 @@
       library_names_spec='$libname$release$shared_ext$versuffix $libname$shared_ext$versuffix'
       need_version=yes
       ;;
+    linux)
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major ${libname}${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      need_lib_prefix=no
+      need_version=no
+      ;;
   esac
   shlibpath_var=LD_LIBRARY_PATH
   case $host_os in