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