build-sys: fix double prefix with explict --libdir

* with configure --prefix=$HOME --libdir=$HOME usrlib_execdir
  ends up being ${exec_prefix}/${libbir}, which is double-prefixed

* fix: use explict given ${libbir} if is matches ${prefix}/*

Signed-off-by: Christoph Junghans <ottxor@gentoo.org>

diff --git a/configure.ac b/configure.ac
index aae2456d59ede6dffd5e3db895c958d9f50075f0..3eca73e2f159b1c38495e3035aed2102a7f999d2 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -80,7 +80,7 @@ usrsbin_execdir='${exec_prefix}/sbin'
 AC_SUBST([usrsbin_execdir])
 
 AS_CASE([$libdir],
- ['${exec_prefix}/'* | '${prefix}/'* | /usr/*],
+ ['${exec_prefix}/'* | '${prefix}/'* | /usr/* | "${prefix}"/* ],
    [usrlib_execdir=$libdir],
  [usrlib_execdir='${exec_prefix}'$libdir]
 )