diff --git a/check/build.jam b/check/build.jam
new file mode 100644
index 0000000..1ce4f11
--- /dev/null
+++ b/check/build.jam
@@ -0,0 +1,9 @@
+# Copyright Rene Rivera 2015
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+exe predef_check_as_c : predef_check_as_c.c : <include>../include ;
+exe predef_check_as_cpp : predef_check_as_cpp.cpp : <include>../include ;
+exe predef_check_as_objc : predef_check_as_objc.m : <include>../include ;
+exe predef_check_as_objcpp : predef_check_as_objcpp.mm : <include>../include ;
diff --git a/check/predef.jam b/check/predef.jam
new file mode 100644
index 0000000..65c3451
--- /dev/null
+++ b/check/predef.jam
@@ -0,0 +1,98 @@
+# Copyright Rene Rivera 2015
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# Defines rules that provide requirements based on checking
+# conditions using Boost Predef definitions and version numbers.
+
+import modules ;
+import project ;
+import feature ;
+import string ;
+import toolset ;
+import modules ;
+import path ;
+    
+# Create a project for our targets.
+project.extension predef check ;
+
+# Feature to pass check expressions to check programs.
+feature.feature predef-expression : : free ;
+
+# Check programs. Each needs to be compiled for different languages
+# even though they are all the same source code.
+local rule check_target ( language : ext )
+{
+    # Need to use absolute paths because we don't know the
+    # context of the invocation which affects where the paths
+    # originate from.
+	local source_path
+		= [ path.root $(__name__:D)/predef_check_as_$(language).$(ext) [ path.pwd ] ] ;
+	local include_path
+		= [ path.root $(__name__:D)/../include [ path.pwd ] ] ;
+	_check_exe_($(language)) = [
+		exe predef_check_as_$(language)
+			: $(source_path)
+			: <include>$(include_path) ] ;
+	explicit predef_check_as_$(language) ;
+}
+check_target c : c ;
+check_target cpp : cpp ;
+check_target objc : m ;
+check_target objcpp : mm ;
+
+# Checks the expressions and when used evaluates to the true-properties
+# if the expressions are all true. Otherwise evaluates to the
+# false-properties.
+rule check ( expressions + : language ? : true-properties * : false-properties * )
+{
+    # Default to C++ on the check context.
+    language ?= cpp ;
+    
+    local project_target = [ project.target $(__name__) ] ;
+	project.push-current $(project_target) ;
+    local result ;
+    for expression in $(expressions)
+    {
+        # The check program to use.
+        local exe_target = [ $(_check_exe_($(language))).name ] ;
+        exe_target = /check/predef//$(exe_target) ;
+        
+        # Create the check run if we don't have one yet.
+        local key = [ MD5 $(language)::$(expression) ] ;
+        if ! ( $(key) in $(_checks_) )
+        {
+        	_checks_ += $(key) ;
+        	make
+	            $(key).txt :
+	            $(exe_target) :
+	            @$(__name__).predef_check_action :
+	            <predef-expression>$(expression) ;
+			explicit
+				$(key).txt ;
+		}
+        
+        local check_target = [ check-target-builds
+        	/check/predef//$(key).txt $(expression)
+        	: $(true-properties)
+        	: $(false-properties) ] ;
+        
+        result += $(check_target) ;
+    }
+	project.pop-current ;
+    return $(result) ;
+}
+
+# Checks the expressions and when used evaluates to <build>no
+# if the expressions are all false. Otherwise evaluates to the
+# nothing.
+rule require ( expressions + : language ? )
+{
+	return [ check $(expressions) : $(language) : : <build>no ] ;
+}
+
+actions predef_check_action bind PREDEF_CHECK_EXPRESSION
+{
+    $(>) "$(PREDEF_CHECK_EXPRESSION)" > $(<)
+}
diff --git a/check/predef_check_as_c.c b/check/predef_check_as_c.c
new file mode 100644
index 0000000..340cd23
--- /dev/null
+++ b/check/predef_check_as_c.c
@@ -0,0 +1,119 @@
+/*
+Copyright Rene Rivera 2011-2012
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE_1_0.txt or copy at
+http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define BOOST_PREDEF_INTERNAL_GENERATE_TESTS
+
+typedef struct predef_info
+{
+    unsigned tag;
+    const char * name;
+    const char * description;
+    unsigned value;
+} predef_info;
+
+predef_info first_predef_info = { 0x43210DEF , "-" , "-" , 0xFFFFFFFF };
+
+#define BOOST_PREDEF_DECLARE_TEST(x,s) \
+    predef_info x##_predef_info = { 0x67890DEF , #x , s , x };
+#include <boost/predef.h>
+
+predef_info last_predef_info = { 0xFFFFFFFF , "-" , "-" , 0x43210DEF };
+
+int predef_info_compare(const void * a, const void * b)
+{
+    const predef_info ** i = (const predef_info **)a;
+    const predef_info ** j = (const predef_info **)b;
+    return strcmp((*i)->name,(*j)->name);
+}
+
+const char * str_token(const char ** str, const char * space)
+{
+	unsigned span;
+	char * token;
+	for (; **str != 0; *str += 1)
+	{
+		if (0 == strchr(space, **str))
+		{
+			break;
+		}
+	}
+	span = strcspn(*str, space);
+	token = (char *)malloc(span+1);
+	strncpy(token, *str, span);
+	token[span] = 0;
+	for (*str += span; **str != 0; *str += 1)
+	{
+		if (0 == strchr(space, **str))
+		{
+			break;
+		}
+	}
+	return token;
+}
+
+const char * whitespace = " ";
+const char * dot = ".";
+
+int main(int argc, const char ** argv)
+{
+    unsigned x = 0;
+    unsigned argi = 1;
+    predef_info ** predefs = 0;
+    unsigned predef_count = 0;
+    unsigned * i = &first_predef_info.tag;
+    unsigned * e = &last_predef_info.tag;
+    while (i < e)
+    {
+        i += 1;
+        if (*i == 0x67890DEF)
+        {
+            predef_count += 1;
+            predefs = (predef_info**)realloc(predefs,predef_count*sizeof(predef_info*));
+            predefs[predef_count-1] = (predef_info*)i;
+        }
+    }
+    qsort(predefs,predef_count,sizeof(predef_info*),predef_info_compare);
+    for (argi = 1; argi < argc; ++argi)
+    {
+    	const char * exp = argv[argi];
+    	const char * exp_name = str_token(&exp, whitespace);
+    	const char * exp_op = str_token(&exp, whitespace);
+    	const char * exp_val = str_token(&exp, whitespace);
+    	unsigned exp_version = 0;
+    	if (*exp_val != 0)
+    	{
+    		exp = exp_val;
+    		const char * exp_val_a = str_token(&exp, dot);
+    		const char * exp_val_b = str_token(&exp, dot);
+    		const char * exp_val_c = str_token(&exp, dot);
+    		exp_version = BOOST_VERSION_NUMBER(atoi(exp_val_a), atoi(exp_val_b),atoi(exp_val_c));
+    	}
+		for (x = 0; x < predef_count; ++x)
+		{
+			if (*exp_op == 0 &&
+				predefs[x]->value == 0 &&
+				strcmp(exp_name, predefs[x]->name) == 0)
+			{
+				return argi;
+			}
+			else if (*exp_op != 0 && *exp_val != 0 &&
+				strcmp(exp_name, predefs[x]->name) == 0)
+			{
+				if (0 == strcmp(">",exp_op) && !(predefs[x]->value > exp_version)) return argi;
+				if (0 == strcmp("<",exp_op) && !(predefs[x]->value < exp_version)) return argi;
+				if (0 == strcmp(">=",exp_op) && !(predefs[x]->value >= exp_version)) return argi;
+				if (0 == strcmp("<=",exp_op) && !(predefs[x]->value <= exp_version)) return argi;
+				if (0 == strcmp("==",exp_op) && !(predefs[x]->value == exp_version)) return argi;
+				if (0 == strcmp("!=",exp_op) && !(predefs[x]->value != exp_version)) return argi;
+			}
+		}
+    }
+    return 0;
+}
diff --git a/check/predef_check_as_cpp.cpp b/check/predef_check_as_cpp.cpp
new file mode 100644
index 0000000..c58abe7
--- /dev/null
+++ b/check/predef_check_as_cpp.cpp
@@ -0,0 +1 @@
+#include "predef_check_as_c.c"
diff --git a/check/predef_check_as_objc.m b/check/predef_check_as_objc.m
new file mode 100644
index 0000000..c58abe7
--- /dev/null
+++ b/check/predef_check_as_objc.m
@@ -0,0 +1 @@
+#include "predef_check_as_c.c"
diff --git a/check/predef_check_as_objcpp.mm b/check/predef_check_as_objcpp.mm
new file mode 100644
index 0000000..c58abe7
--- /dev/null
+++ b/check/predef_check_as_objcpp.mm
@@ -0,0 +1 @@
+#include "predef_check_as_c.c"
diff --git a/doc/html/index.html b/doc/html/index.html
index 603afa7..fa8d249 100644
--- a/doc/html/index.html
+++ b/doc/html/index.html
@@ -52,7 +52,7 @@
 </div>
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
-<td align="left"><p><small>Last revised: December 30, 2014 at 14:12:07 GMT</small></p></td>
+<td align="left"><p><small>Last revised: January 27, 2015 at 14:25:08 GMT</small></p></td>
 <td align="right"><div class="copyright-footer"></div></td>
 </tr></table>
 <hr>
diff --git a/test/build.jam b/test/build.jam
index 10ba4f8..28e1473 100755
--- a/test/build.jam
+++ b/test/build.jam
@@ -4,6 +4,8 @@
 # (See accompanying file LICENSE_1_0.txt or copy at
 # http://www.boost.org/LICENSE_1_0.txt)
 
+import ../check/predef : require : predef-require ;
+
 local predef-include-root ;
 local predef-dependency ;
 
@@ -53,6 +55,6 @@ test-suite predef :
     [ run info_as_objc.m : : : <test-info>always_show_run_output ]
     [ run version.cpp ]
     [ run make.cpp ]
-    [ compile macos_endian.c ]
-    [ compile macos_vs_bsd.c ]
+    [ compile macos_endian.c : [ predef-require "BOOST_OS_MACOS" : cpp ] ]
+    [ compile macos_vs_bsd.c : [ predef-require "BOOST_OS_MACOS" : cpp ] ]
     ;