m4/curl-compilers.m4: use proper quotes around string, not backticks

... when setting clang version to assume 3.7

Caused a lot of "integer expression expected" warnings by configure.

diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 3c87efa0952a05437a44c467f954fb179e9ef8c2..7705e637fb6ddc039e550133fdca9f63006e5d89 100644 (file)
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -89,7 +89,7 @@ AC_DEFUN([CURL_CHECK_COMPILER_CLANG], [
     if test -z "$clangver"; then
       if echo $fullclangver | grep "Apple LLVM version " >/dev/null; then
         dnl Starting with XCode 7 / clang 3.7, Apple clang won't tell its upstream version
-        clangver=`3.7`
+        clangver="3.7"
       else
         clangver=`echo $fullclangver | "$SED" 's/.*version \(@<:@0-9@:>@*\.@<:@0-9@:>@*\).*/\1/'`
       fi