diff --git a/ci.hocon b/ci.hocon
index 99fe13999bd42d2af1834853497038578c51f568..770710ffb731062d8b6ce98f71374ff776805e63 100644
--- a/ci.hocon
+++ b/ci.hocon
@@ -25,6 +25,17 @@ logfiles : [
     "com.oracle.truffle.r.native/gnur/libiconv-*/iconv_make.log"
   ]
 
+# This is needed by all (Linux) builds but is specific to the module system employed
+# on the CI cluster. Not all of the modules are needed by FastR but all are needed by the
+# embedded GNU R that is built within FastR.
+
+pkgEnvironment: {
+  environment : {
+    PKG_INCLUDE_FLAGS_OVERRIDE : """"-I/cm/shared/apps/zlib/1.2.8/include -I/cm/shared/apps/bzip2/1.0.6/include -I/cm/shared/apps/xz/5.2.2/include -I/cm/shared/apps/pcre/8.38/include -I/cm/shared/apps/curl/7.50.1/include""""
+    PKG_LDFLAGS_OVERRIDE : """"-L/cm/shared/apps/zlib/1.2.8/lib -L/cm/shared/apps/bzip2/1.0.6/lib -L/cm/shared/apps/xz/5.2.2/lib -L/cm/shared/apps/pcre/8.38/lib -L/cm/shared/apps/curl/7.50.1//lib -L/cm/shared/apps/gcc/4.9.1/lib64""""
+  }
+}
+
 packagesLinux : ${pkgEnvironment} {
   packages : {
     git : ">=1.8.3"
@@ -76,6 +87,13 @@ gateTestCommon : ${common} {
 gateTestLinux : ${gateTestCommon} {
 }
 
+darwinEnvironment : {
+  environment :  {
+    PATH : "/usr/local/bin:$JAVA_HOME/bin:$PATH"
+    F77: "/usr/local/bin/gfortran-4.9"
+  }
+}
+
 gateTestDarwin : ${gateTestCommon} ${darwinEnvironment} {
   packages : ${packagesDarwin} {
   }