diff --git a/ompi/mca/mpool/base/base.h b/ompi/mca/mpool/base/base.h
index 11ab88c788..3e66d46f52 100644
--- a/ompi/mca/mpool/base/base.h
+++ b/ompi/mca/mpool/base/base.h
@@ -29,6 +29,12 @@
 #include "ompi/mca/mpool/mpool.h"
 #include "opal/threads/mutex.h" 
 
+#if defined(HAVE_MALLOPT) && defined(M_TRIM_THRESHOLD) && defined(M_MMAP_MAX)
+#define MPOOL_BASE_CAN_DISABLE_SBRK 1
+#else
+#define MPOOL_BASE_CAN_DISABLE_SBRK 0
+#endif
+
 #if defined(c_plusplus) || defined(__cplusplus)
 extern "C" {
 #endif
diff --git a/ompi/mca/mpool/base/mpool_base_lookup.c b/ompi/mca/mpool/base/mpool_base_lookup.c
index 56a61a7b0e..1bfadabe9f 100644
--- a/ompi/mca/mpool/base/mpool_base_lookup.c
+++ b/ompi/mca/mpool/base/mpool_base_lookup.c
@@ -27,10 +27,10 @@
 #include "ompi/mca/mpool/base/base.h"
 #include "mpool_base_mem_cb.h"
 
-#if defined(HAVE_MALLOPT)
+#if MPOOL_BASE_CAN_DISABLE_SBRK
 #include <malloc.h>
 extern int mca_mpool_base_disable_sbrk;
-#endif  /* defined(HAVE_MALLOPT) */
+#endif  /* MPOOL_BASE_CAN_DISABLE_SBRK */
 
 
 extern int mca_mpool_base_use_mem_hooks;
@@ -99,12 +99,12 @@ mca_mpool_base_module_t* mca_mpool_base_module_create(
               OBJ_CONSTRUCT(&mca_mpool_base_mem_cb_array, ompi_pointer_array_t);
         }
 
-#if defined(HAVE_MALLOPT)
+#if MPOOL_BASE_CAN_DISABLE_SBRK
         else if(mca_mpool_base_disable_sbrk) { 
             mallopt(M_TRIM_THRESHOLD, -1); 
             mallopt(M_MMAP_MAX, 0);
         }
-#endif  /* defined(HAVE_MALLOPT) */
+#endif  /* MPOOL_BASE_CAN_DISABLE_SBRK */
     }
     return module; 
 }
diff --git a/ompi/mca/mpool/base/mpool_base_open.c b/ompi/mca/mpool/base/mpool_base_open.c
index 6237853ba5..b7a01e2d5d 100644
--- a/ompi/mca/mpool/base/mpool_base_open.c
+++ b/ompi/mca/mpool/base/mpool_base_open.c
@@ -43,7 +43,7 @@
 int mca_mpool_base_output = -1;
 int mca_mpool_base_use_mem_hooks = 0; 
 
-#if defined(HAVE_MALLOPT)
+#if MPOOL_BASE_CAN_DISABLE_SBRK
 int mca_mpool_base_disable_sbrk = 0;
 #endif
 
@@ -63,9 +63,9 @@ int mca_mpool_base_open(void)
        mca_mpool_base_components list */
     
     int use_mem_hooks;
-#if defined(HAVE_MALLOPT)
+#if MPOOL_BASE_CAN_DISABLE_SBRK
     int disable_sbrk;
-#endif  /* defined(HAVE_MALLOPT) */
+#endif  /* MPOOL_BASE_CAN_DISABLE_SBRK */
     
     if (OMPI_SUCCESS != 
         mca_base_components_open("mpool", 0, mca_mpool_base_static_components, 
@@ -101,7 +101,7 @@ int mca_mpool_base_open(void)
     mca_mpool_base_use_mem_hooks = use_mem_hooks || mca_mpool_base_use_mem_hooks;
 
     
-#if defined(HAVE_MALLOPT)
+#if MPOOL_BASE_CAN_DISABLE_SBRK
     mca_base_param_reg_int_name("mpool", 
                                 "base_disable_sbrk", 
                                 "use mallopt to override calling sbrk (doesn't return memory to OS!)",
@@ -123,7 +123,7 @@ int mca_mpool_base_open(void)
 #endif
 
     /* force mem hooks if leave_pinned or leave_pinned_pipeline is enabled */
-#if defined(HAVE_MALLOPT)
+#if MPOOL_BASE_CAN_DISABLE_SBRK
     if(0 == mca_mpool_base_use_mem_hooks && 0 == mca_mpool_base_disable_sbrk) {
 #else 
     if(0 == mca_mpool_base_use_mem_hooks ) {