Honor the DESTDIR variable to install out-of-place (Eg. for packaging).

 /trunk/configure         |   10    10     0     0 +++++++++
 /trunk/Makefile.in       |   62    36    26     0 +++++++++++++++++++++++++++++++-----------------------
 /trunk/docs/overview.txt |   12    12     0     0 ++++++++++
 3 files changed, 58 insertions(+), 26 deletions(-)

1 files changed, 10 insertions, 0 deletions

diff --git a/configure b/configure
index 8b20f2c..ce32ac7 100755
--- a/configure
+++ b/configure
@@ -277,6 +277,16 @@ echo "${VERSION}"
 [ -z "${DOCDIR_set}" ] && DOCDIR="${PREFIX}/share/doc/ct-ng-${VERSION}"
 [ -z "${MANDIR_set}" ] && MANDIR="${PREFIX}/share/man/man1"
 
+# Check that install PATHs are absolute
+for p in BIN LIB DOC MAN; do
+  var="${p}DIR"
+  eval v="\${${var}}"
+  case "${v}" in
+    /*) ;;
+    *)  do_error "'${var}' is not an absolute path: '${v}'"
+  esac
+done
+
 # Check the existence of absolutely required tools
 { IFS='
 ';