Fix using single quotes where double quotes should be used.

diff --git a/configure b/configure
index de9e93777355ac2bc2f2f99a8256b7940dcb5f6a..e3aaed040f14bfaa32c15905d5f37d6360ffd075 100755 (executable)
--- a/configure
+++ b/configure
@@ -393,7 +393,7 @@ if (prompt_bool $interactive, $question, 0) {
                'm_regex_pcre.cpp'      => 'pcre-config --version',
                'm_regex_posix.cpp'     => undef,
                'm_regex_re2.cpp'       => 'pkg-config --exists re2',
-               'm_regex_stdlib.cpp'    => '$config{CXX} -o /dev/null -std=c++11 $RealDir/make/test/compiler.cpp',
+               'm_regex_stdlib.cpp'    => "$config{CXX} -o /dev/null -std=c++11 $RealDir/make/test/compiler.cpp",
                'm_regex_tre.cpp'       => 'pkg-config --exists tre',
                'm_sqlite3.cpp'         => 'pkg-config --exists sqlite3',
                'm_ssl_gnutls.cpp'      => 'pkg-config --exists gnutls',