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Fixes #1503. Using tesseract-ocr's stock pkg-config, it would produce an error due to unquoted whitespace: $ test ! -z `pkg-config --libs-only-l --silence-errors tesseract` bash: test: syntax error: `-larchive' unexpected * linux/configure.ac: Use a positive test, and double-quote the $() command substitution. Co-authored-by: Carlos Fernandez Sanz <carlos@ccextractor.org>