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copied!<p>Checking for headers is easy; just use <code>AC_CHECK_HEADER</code>. If it's in a weird place (i.e., one the compiler doesn't know about), it's entirely reasonable to expect users to set <code>CPPFLAGS</code>.</p> <p>The hard part is actually locating <code>libjvm</code>. You typically don't want to link with this; but you may want to default to a location to <code>dlopen</code> it from if <code>JAVA_HOME</code> is not set at run time.</p> <p>But I don't have a better solution than requiring that <code>JAVA_HOME</code> be set at configure time. There's just too much variation in how this stuff is deployed across various OSes (even just Linux distributions). This is what I do:</p> <pre><code>AC_CHECK_HEADER([jni.h], [have_jni=yes]) AC_ARG_VAR([JAVA_HOME], [Java Runtime Environment (JRE) location]) AC_ARG_ENABLE([java-feature], [AC_HELP_STRING([--disable-java-feature], [disable Java feature])]) case $target_cpu in x86_64) JVM_ARCH=amd64 ;; i?86) JVM_ARCH=i386 ;; *) JVM_ARCH=$target_cpu ;; esac AC_SUBST([JVM_ARCH]) AS_IF([test X$enable_java_feature != Xno], [AS_IF([test X$have_jni != Xyes], [AC_MSG_FAILURE([The Java Native Interface is required for Java feature.])]) AS_IF([test -z "$JAVA_HOME"], [AC_MSG_WARN([JAVA_HOME has not been set. JAVA_HOME must be set at run time to locate libjvm.])], [save_LDFLAGS=$LDFLAGS LDFLAGS="-L$JAVA_HOME/lib/$JVM_ARCH/client -L$JAVA_HOME/lib/$JVM_ARCH/server $LDFLAGS" AC_CHECK_LIB([jvm], [JNI_CreateJavaVM], [LIBS=$LIBS], [AC_MSG_WARN([no libjvm found at JAVA_HOME])]) LDFLAGS=$save_LDFLAGS ])]) </code></pre>

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