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diff --git a/common/autoconf/boot-jdk.m4 b/common/autoconf/boot-jdk.m4
index ace6f7d..c13cde7 100644
--- a/common/autoconf/boot-jdk.m4
+++ b/common/autoconf/boot-jdk.m4
@@ -51,7 +51,7 @@ AC_DEFUN([BOOTJDK_DO_CHECK],
BOOT_JDK_FOUND=no
else
# Oh, this is looking good! We probably have found a proper JDK. Is it the correct version?
- BOOT_JDK_VERSION=`"$BOOT_JDK/bin/java" -version 2>&1 | head -n 1`
+ BOOT_JDK_VERSION=`"$BOOT_JDK/bin/java" -version 2>&1 | grep -F version`
# Extra M4 quote needed to protect [] in grep expression.
[FOUND_VERSION_78=`echo $BOOT_JDK_VERSION | grep '\"1\.[78]\.'`]
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