diff --git a/ompi/mca/coll/fca/coll_fca_api.h b/ompi/mca/coll/fca/coll_fca_api.h
index 335d316801..a10f7df1b3 100644
--- a/ompi/mca/coll/fca/coll_fca_api.h
+++ b/ompi/mca/coll/fca/coll_fca_api.h
@@ -113,18 +113,12 @@ static inline void mca_coll_fca_get_reduce_root(int root_rank, int my_rank,
     spec->is_root = root_rank == my_rank;
 }
 
-#elif OMPI_FCA_VERSION == 20 || OMPI_FCA_VERSION == 21
+#elif OMPI_FCA_VERSION == 20 || OMPI_FCA_VERSION == 21 || OMPI_FCA_VERSION == 22
 
 #define OMPI_FCA_ALLGATHER          1
+#define OMPI_FCA_ALLGATHERV         1
 #define OMPI_FCA_PROGRESS           1
 
-#define FCA_API_ABI_MAJOR           2
-#if OMPI_FCA_VERSION == 20
-#  define FCA_API_ABI_MINOR         0
-#else
-#  define FCA_API_ABI_MINOR         1
-#endif
-
 typedef struct mca_coll_fca_ops_t {
 
     /* FCA Context operations */
diff --git a/ompi/mca/coll/fca/coll_fca_component.c b/ompi/mca/coll/fca/coll_fca_component.c
index a5fb1fbe2c..551782f472 100644
--- a/ompi/mca/coll/fca/coll_fca_component.c
+++ b/ompi/mca/coll/fca/coll_fca_component.c
@@ -128,7 +128,8 @@ int mca_coll_fca_get_fca_lib(struct ompi_communicator_t *comm)
 {
     struct fca_init_spec *spec;
     int ret;
-    unsigned long fca_ver;
+    unsigned long fca_ver, major, minor, detected_ver;
+    char x[3];
 
     if (mca_coll_fca_component.fca_lib_handle)
         return OMPI_SUCCESS;
@@ -145,12 +146,19 @@ int mca_coll_fca_get_fca_lib(struct ompi_communicator_t *comm)
     GET_FCA_SYM(get_version);
     GET_FCA_SYM(get_version_string);
 
+
     fca_ver = FCA_API_CLEAR_MICRO(mca_coll_fca_component.fca_ops.get_version());
-    if (fca_ver != FCA_API_VER(FCA_API_ABI_MAJOR,FCA_API_ABI_MINOR)) {
-        FCA_ERROR("Unsupported FCA version: %s, please update FCA to v%d.%d",
+    major = (fca_ver>>FCA_MAJOR_BIT);
+    minor = (fca_ver>>FCA_MINOR_BIT) & 0xf;
+    sprintf(x, "%ld%ld", major, minor);
+    detected_ver = atol(x);
+
+    FCA_VERBOSE(1, "FCA ABI version: %ld supported: %d", detected_ver, OMPI_FCA_VERSION);
+
+    if (detected_ver != OMPI_FCA_VERSION) {
+        FCA_ERROR("Unsupported FCA version: %s, please update FCA to v%d, now v%ld",
                   mca_coll_fca_component.fca_ops.get_version_string(),
-                  FCA_API_ABI_MAJOR,
-                  FCA_API_ABI_MINOR);
+                  OMPI_FCA_VERSION, fca_ver);
         return OMPI_ERROR;
     }
 
@@ -296,7 +304,7 @@ static int fca_register(void)
     mca_base_param_reg_int(c, "enable_allgatherv",
                            "[1|0|] Enable/Disable FCA Allgatherv support",
                            false, false,
-                           OMPI_FCA_ALLGATHER,
+                           OMPI_FCA_ALLGATHERV,
                            &mca_coll_fca_component.fca_enable_allgatherv);
 
     mca_base_param_reg_int(c, "enable_gather",
diff --git a/ompi/mca/coll/fca/coll_fca_module.c b/ompi/mca/coll/fca/coll_fca_module.c
index d4915f98f5..246f3c9628 100644
--- a/ompi/mca/coll/fca/coll_fca_module.c
+++ b/ompi/mca/coll/fca/coll_fca_module.c
@@ -122,8 +122,8 @@ static int __fca_comm_new(mca_coll_fca_module_t *fca_module)
 
     /* Allocate buffer for gathering rank information on rank0 */
     if (fca_module->rank == 0) {
-        FCA_MODULE_VERBOSE(fca_module, 1, "Total rank_info size: %d", all_info_size);
         all_info_size = 0;
+        FCA_MODULE_VERBOSE(fca_module, 1, "Total rank_info size: %d", all_info_size);
         disps = calloc(ompi_comm_size(comm), sizeof *disps);
         for (i = 0; i < ompi_comm_size(comm); ++i) {
             disps[i] = all_info_size;
diff --git a/ompi/mca/coll/fca/coll_fca_ops.c b/ompi/mca/coll/fca/coll_fca_ops.c
index 895f5f61a1..0ab5b7f014 100644
--- a/ompi/mca/coll/fca/coll_fca_ops.c
+++ b/ompi/mca/coll/fca/coll_fca_ops.c
@@ -189,7 +189,7 @@ int mca_coll_fca_bcast(void *buff, int count, struct ompi_datatype_t *datatype,
     /* Setup exchange buffer */
     spec.root = root;
     if (mca_coll_fca_array_size(datatype, count, &gap, &size)) {
-        spec.buf = buff + gap;
+        spec.buf = (char*)buff + gap;
     } else {
         mca_coll_fca_convertor_create(&conv, datatype, count, buff,
                                       (root == fca_module->rank)
@@ -336,7 +336,7 @@ static size_t __setup_gather_sendbuf(void *sbuf, void *inplace_sbuf, int scount,
     size_t gap, ssize;
 
     if (mca_coll_fca_array_size(sdtype, scount, &gap, &ssize)) {
-        *real_sendbuf = ((MPI_IN_PLACE == sbuf) ? inplace_sbuf : sbuf) + gap;
+        *real_sendbuf = (char*)((MPI_IN_PLACE == sbuf) ? inplace_sbuf : sbuf) + gap;
     } else {
         FCA_VERBOSE(5, "Packing send buffer");
         if (MPI_IN_PLACE == sbuf) {