diff --git a/externals/coda-oss/modules/c++/sys/source/OSUnix.cpp b/externals/coda-oss/modules/c++/sys/source/OSUnix.cpp
index 9367cf1fd..4ebeec1f3 100644
--- a/externals/coda-oss/modules/c++/sys/source/OSUnix.cpp
+++ b/externals/coda-oss/modules/c++/sys/source/OSUnix.cpp
@@ -30,6 +30,17 @@
 #include <sstream>
 #include <limits.h>
 
+#if defined(__APPLE__)
+
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <mach/vm_statistics.h>
+#include <mach/mach_types.h>
+#include <mach/mach_init.h>
+#include <mach/mach_host.h>
+
+#endif
+
 #include "sys/OSUnix.h"
 #include "sys/File.h"
 
@@ -275,12 +286,47 @@ size_t sysconfCaller(int name)
 
 void sys::OSUnix::getMemInfo(size_t &totalPhysMem, size_t &freePhysMem) const
 {
+    // Unfortunately sysctl is the best way to do this on OSX,
+    // but sysctl is deprecated in favor of sysconf on linux
+#if defined(__APPLE__)
+    long long physMem = 0;
+    size_t size = sizeof(physMem);
+    int status = sysctlbyname("hw.memsize", &physMem, &size, 0, 0);
+    if(status)
+    {
+        throw sys::SystemException(Ctxt("Call to sysctl() has failed"));
+    }
+
+    mach_port_t            machPort = mach_host_self();
+    mach_msg_type_number_t count     = HOST_VM_INFO_COUNT;
+    vm_size_t              pageSize = 0;
+    vm_statistics_data_t   vmstat;
+
+    if(KERN_SUCCESS != host_statistics(machPort, HOST_VM_INFO, 
+                (host_info_t) &vmstat, &count))
+    {
+        throw sys::SystemException(Ctxt("Call to host_statistics() has failed"));
+    }
+
+    if(KERN_SUCCESS != host_page_size(machPort, &pageSize))
+    {
+        throw sys::SystemException(Ctxt("Call to host_page_size has failed"));
+    }
+
+    long long freeBytes = vmstat.free_count * pageSize;
+    
+    totalPhysMem = physMem / 1024 / 1024;
+    freePhysMem = freeBytes / 1024 / 1024;
+
+#else
     long long pageSize = sysconfCaller(_SC_PAGESIZE);
     long long totalNumPages = sysconfCaller(_SC_PHYS_PAGES);
     long long availNumPages = sysconfCaller(_SC_AVPHYS_PAGES);
 
     totalPhysMem = (pageSize*totalNumPages/1024)/1024;
     freePhysMem = (pageSize*availNumPages/1024)/1024;
+
+#endif
 }
 
 void sys::DirectoryUnix::close()
diff --git a/externals/coda-oss/modules/c++/sys/tests/OSTest.cpp b/externals/coda-oss/modules/c++/sys/tests/OSTest.cpp
index 753c7dd2b..70708e807 100644
--- a/externals/coda-oss/modules/c++/sys/tests/OSTest.cpp
+++ b/externals/coda-oss/modules/c++/sys/tests/OSTest.cpp
@@ -47,6 +47,13 @@ int main(int argc, char **argv)
         std::cout << "The delimiter on this platform: " << os.getDelimiter()
                 << std::endl;
         std::cout << "The process id: " << os.getProcessId() << std::endl;
+
+        size_t freeMemory = 0;
+        size_t physMemory = 0;
+        os.getMemInfo(physMemory, freeMemory);
+        std::cout << "Total physical memory (MB): " << physMemory << std::endl;
+        std::cout << "Total free memory (MB): " << freeMemory << std::endl;
+
         //std::cout << "The user is: " << os.getUsername() << std::endl;
         /////////////////////////////////////////////
         // File exists check!!!
diff --git a/projects/csm/wscript b/projects/csm/wscript
index 1ccea34e9..473686d4d 100644
--- a/projects/csm/wscript
+++ b/projects/csm/wscript
@@ -5,6 +5,7 @@ PLUGIN             = 'CSM'
 REMOVEPLUGINPREFIX = True
 
 import sys, os, re
+from waflib import Errors
 
 DIRS = 'external'
 
@@ -22,6 +23,7 @@ def configure(conf):
     linuxRegex = r'.*-.*-linux-.*|i686-pc-.*|linux'
     solarisRegex = r'sparc-sun.*|i.86-pc-solaris.*|sunos'
     winRegex = r'win32'
+    osxRegex = r'darwin'
     if re.match(linuxRegex, sys.platform):
         platformName = 'linux'
     elif re.match(solarisRegex, sys.platform):
@@ -37,6 +39,8 @@ def configure(conf):
         #       For example, if you're building with VS 2008 Express, use:
         #       --enable-32bit "--msvc_version=msvc 9.0Exp" 
         platformName = 'winVC' + str(conf.env['MSVC_VERSION']).replace('.', '')
+    elif re.match(osxRegex,sys.platform):
+        platformName='darwin'
     else:
         raise Errors.WafError('Unsupported platform %s' % sys.platform)