X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=configure;h=dc0dba4c12f5c93908b59c31b2b2dd589464ea87;hp=71981b7c614a58f6b916acd49cf6515253dce396;hb=8a745d310f966194e82f12f6453f05cc877379d6;hpb=6acd61dad91cb1b5c43261a3c6cf7583ecf16f13

diff --git a/configure b/configure
index 71981b7c..dc0dba4c 100755
--- a/configure
+++ b/configure
@@ -1,7 +1,21 @@
 #! /bin/sh
 
+# Test whether this shell is capable of parameter substring processing.
+( option='a/b'; : ${option#*/} ) 2>/dev/null || {
+    echo "
+The shell interpreting '$0' is lacking some required features.
+
+To work around this problem you may try to execute:
+
+    ksh $0 $*
+ or
+    bash $0 $*
+"
+    exit 1
+}
+
 # Store original IFS value so it can be changed (and restored) in many places.
-readonly DEFAULT_IFS=$IFS
+readonly DEFAULT_IFS="$IFS"
 
 srcdir=$(dirname "$0")
 
@@ -114,6 +128,10 @@ Fine tuning of some installation directories is available:
 	--bashcompletiondir=DIR Bash completions files [SYSCONFDIR/bash_completion.d]
 	--zshcompletiondir=DIR	Zsh completions files [PREFIX/share/zsh/functions/Completion/Unix]
 
+Some specific library versions can be specified (auto-detected otherwise):
+
+        --with-gmime-version=VERS       Specify GMIME version (2.4 or 2.6)
+
 Some features can be disabled (--with-feature=no is equivalent to
 --without-feature) :