README.rpm-dist: postgresql-libs subpackage is not mandatory

* README.rpm-dist.template: Opt-out *-libs docs.
* configure.ac: Add --without-libs-pkg option.

Author: praiskup

README.rpm-dist.template

@@ -205,10 +205,12 @@ m4_divert[]m4_dnl
           <entry>@NAME_PACKAGE@:</entry>
           <entry>Key client programs and basic documentation</entry>
         </row>
+m4_ifelse([@LIBS_ENABLED@],[yes], [
         <row>
           <entry>@NAME_PACKAGE@-libs:</entry>
           <entry>Client shared libraries</entry>
         </row>
+])
         <row>
           <entry>@NAME_PACKAGE@-server:</entry>
           <entry>Server executables and data files</entry>
@@ -249,9 +251,11 @@ m4_divert[]m4_dnl
     </tgroup>
   </table>
   <para>
-    You have to install @NAME_PACKAGE@ and @NAME_PACKAGE@-libs to do anything.
-    @NAME_PACKAGE@-server is needed unless you only plan to use the clients to
-    work with a remote PostgreSQL server. The others are optional.
+    You have to install @NAME_PACKAGE@
+    m4_ifelse([@LIBS_ENABLED@], [yes], [and @NAME_PACKAGE@-libs])
+    to do anything.
+    Package @NAME_PACKAGE@-server is needed unless you only plan to use the
+    clients to work with a remote PostgreSQL server. The others are optional.
   </para>
   <para>
     Note that there are no @NAME_PACKAGE@-perl, @NAME_PACKAGE@-jdbc,

configure.ac

@@ -139,7 +139,10 @@ SCL_SOURCE=:
 SCL_SHELL_WRAPPER=
 
 scl_enabled_build=false
-AC_ARG_WITH([scl], [Build against Software Collections RPM], [scl_enabled_build=:])
+AC_ARG_WITH([scl],
+            [AS_HELP_STRING([--with-scl],
+                            [Build against Software Collections RPM])],
+            [scl_enabled_build=:])
 if $scl_enabled_build; then
     AC_MSG_CHECKING([which SCL to build against])
     SCL=`rpm --eval %scl`
@@ -156,6 +159,12 @@ if $scl_enabled_build; then
     fi
 fi
 
+AC_ARG_WITH([libs-pkg],
+            [AS_HELP_STRING([--without-libs-pkg],
+                            [PostgreSQL installation will not have postgresql-libs])],
+            [], [withval=yes])
+_AX_TEXT_TPL_SUBST([LIBS_ENABLED], [$withval])
+
 PGSETUP_SUBST_OPT([NAME_SRV_PFX], [],
                   [service name prefix, like (PFX)postgresql.service])
 PGSETUP_SUBST_OPT([NAME_SRV_SFX], [],