ensure that javac is available

Reviewed By: jeremydubreil

Differential Revision: D2713025

fb-gh-sync-id: 285c326

INSTALL.md

@@ -24,7 +24,7 @@ compile everything from source (see the end of this document).
 
 - opam (instructions [here](https://opam.ocaml.org/doc/Install.html#OSX))
 - Python 2.7
-- Java >= 1.7 (only needed for the Java analysis)
+- Java (only needed for the Java analysis)
 - clang in Xcode command line tools. You can install them with the command
   `xcode-select --install` (only needed for the C/Objective-C analysis)
 - Xcode >= 6.1 (only needed for the C/Objective-C analysis)
@@ -61,7 +61,7 @@ compile everything from source (see the end of this document).
 - gcc >= 4.7.2
 - opam
 - Python 2.7
-- Java >= 1.7 (only needed for the Java analysis)
+- Java (only needed for the Java analysis)
 
 ### How to install the dependencies on Ubuntu 12.04.4 LTS
 

configure.ac

@@ -30,6 +30,9 @@ AC_PROG_OBJC
 AC_CHECK_TOOL([PYTHON27], [python2.7], [no])
 AC_ASSERT_PROG([python2.7], [$PYTHON27])
 
+AC_CHECK_TOOL([JAVAC], [javac], [no])
+AC_ASSERT_PROG([javac], [$JAVAC])
+
 # OCaml dependencies
 AC_PROG_OCAML
 AC_ASSERT_PROG([ocamlc], [$OCAMLC])