Try to make bash script work for os x.

b8324f5a · Davis King · e3f67173 · b8324f5a
Commit b8324f5a authored Mar 17, 2019 by Davis King
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dlib/travis/build-and-test.sh dlib/travis/build-and-test.sh +1 -1

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--- a/dlib/travis/build-and-test.sh
+++ b/dlib/travis/build-and-test.sh
@@ -3,7 +3,7 @@
 set -eux
 # execute the contents of MATRIX_EVAL if it's set
-if [[ -v MATRIX_EVAL ]]; then
+if [ -n "${MATRIX_EVAL+set}" ]; then
    eval "${MATRIX_EVAL}"
 fi