configure: do not require hg when configuring in an hg clone

When configuring in an hg clone, we need hg to compute the version string.
It can happen that users do not have Mercurial (eg. if they got a snapshot
rather that they did a full clone). In this case, we can still run, of
course, so simply fill the version string with a sufficiently explicit
value, that does not require hg. The date is a good candidate.

1 files changed, 3 insertions, 4 deletions

diff --git a/configure b/configure
index c7768c4c..e02b6520 100755
--- a/configure
+++ b/configure
@@ -383,11 +383,10 @@ has_or_abort lib="${ncurses_libs}"                  \
 
 # If this version is n hg clone, try to get the revision number
 # If we can't get the revision number, use date
+printf "Computing version string... "
 case "${VERSION}" in
     *+hg|hg)
-        has_or_abort prog=hg
-        printf "Computing version string... "
-        REVISION="$( hg id -n 2>/dev/null )"
+        REVISION="$( hg id -n 2>/dev/null || true )"
         case "${REVISION}" in
             "")
                 VERSION="${VERSION}_unknown@$( date +%Y%m%d.%H%M%S )";;
@@ -400,7 +399,7 @@ case "${VERSION}" in
         VERSION="$( printf "${VERSION}\n" |"${sed}" -r -e 's|/+|_|g;' )"
         ;;
 esac
-echo "${VERSION}"
+printf "${VERSION}\n"
 
 #---------------------------------------------------------------------
 # Compute and check install paths