diff --git a/CHANGELOG.md b/CHANGELOG.md
index bda3f1f..3860b9d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## Development Build: v2.5.0-rc4+dev45
+- adjust subscription table based on apps present
+- See <https://github.com/nasa/to_lab/pull/153>
+
 ## Development Build: v2.5.0-rc4+dev41
 - update cmake recipe
 - See <https://github.com/nasa/to_lab/pull/150>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 023e438..f3fa9a8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,13 +1,20 @@
 cmake_minimum_required(VERSION 3.5)
 project(CFS_TO_LAB C)
 
+set(TO_TABLE_COMPILE_DEFS)
+
 # These references are specifically needed for the table build
 # it is easiest to add them as directory properties so they won't
-# be considered include directories for TO_LAB itself.
-include_directories(
-    $<TARGET_PROPERTY:ci_lab,INTERFACE_INCLUDE_DIRECTORIES>
-    $<TARGET_PROPERTY:sample_app,INTERFACE_INCLUDE_DIRECTORIES>
-)
+# be considered include directories for TO_LAB itself.  Each one
+# gets a macro for conditional inclusion in the subscription table.
+foreach(EXT_APP ci_lab sample_app hs fm ds sc lc)
+  list (FIND TGTSYS_${SYSVAR}_APPS ${EXT_APP} HAVE_APP)
+  if (HAVE_APP GREATER_EQUAL 0)
+    include_directories($<TARGET_PROPERTY:${EXT_APP},INTERFACE_INCLUDE_DIRECTORIES>)
+    string(TOUPPER "HAVE_${EXT_APP}" APP_MACRO)
+    add_definitions(-D${APP_MACRO})
+  endif()
+endforeach()
 
 set(APP_SRC_FILES
     fsw/src/to_lab_app.c
diff --git a/fsw/src/to_lab_version.h b/fsw/src/to_lab_version.h
index 74dff51..e4aee7e 100644
--- a/fsw/src/to_lab_version.h
+++ b/fsw/src/to_lab_version.h
@@ -24,7 +24,7 @@
 #define TO_LAB_VERSION_H
 
 /* Development Build Macro Definitions */
-#define TO_LAB_BUILD_NUMBER 41 /*!< Development Build: Number of commits since baseline */
+#define TO_LAB_BUILD_NUMBER 45 /*!< Development Build: Number of commits since baseline */
 #define TO_LAB_BUILD_BASELINE \
     "v2.5.0-rc4" /*!< Development Build: git tag that is the base for the current development */
 
diff --git a/fsw/tables/to_lab_sub.c b/fsw/tables/to_lab_sub.c
index 9aee964..1fc926f 100644
--- a/fsw/tables/to_lab_sub.c
+++ b/fsw/tables/to_lab_sub.c
@@ -28,37 +28,39 @@
 /*
 ** Add the proper include file for the message IDs below
 */
-
-/*
-** Common CFS app includes below are commented out
-*/
 #include "to_lab_msgids.h"
+
+#ifdef HAVE_CI_LAB
 #include "ci_lab_msgids.h"
+#endif
 
+#ifdef HAVE_SAMPLE_APP
 #include "sample_app_msgids.h"
+#endif
 
-#if 0
+#ifdef HAVE_HS_APP
 #include "hs_msgids.h"
+#endif
+
+#ifdef HAVE_FM_APP
 #include "fm_msgids.h"
+#endif
+
+#ifdef HAVE_SC_APP
 #include "sc_msgids.h"
+#endif
+
+#ifdef HAVE_DS_APP
 #include "ds_msgids.h"
+#endif
+
+#ifdef HAVE_LC_APP
 #include "lc_msgids.h"
 #endif
 
 TO_LAB_Subs_t TO_LAB_Subs = {.Subs = {/* CFS App Subscriptions */
                                       {CFE_SB_MSGID_WRAP_VALUE(TO_LAB_HK_TLM_MID), {0, 0}, 4},
                                       {CFE_SB_MSGID_WRAP_VALUE(TO_LAB_DATA_TYPES_MID), {0, 0}, 4},
-                                      {CFE_SB_MSGID_WRAP_VALUE(CI_LAB_HK_TLM_MID), {0, 0}, 4},
-                                      {CFE_SB_MSGID_WRAP_VALUE(SAMPLE_APP_HK_TLM_MID), {0, 0}, 4},
-
-#if 0
-        /* Add these if needed */
-        {CFE_SB_MSGID_WRAP_VALUE(HS_HK_TLM_MID), {0,0}, 4},
-        {CFE_SB_MSGID_WRAP_VALUE(FM_HK_TLM_MID), {0,0}, 4},
-        {CFE_SB_MSGID_WRAP_VALUE(SC_HK_TLM_MID), {0,0}, 4},
-        {CFE_SB_MSGID_WRAP_VALUE(DS_HK_TLM_MID), {0,0}, 4},
-        {CFE_SB_MSGID_WRAP_VALUE(LC_HK_TLM_MID), {0,0}, 4},
-#endif
 
                                       /* cFE Core subscriptions */
                                       {CFE_SB_MSGID_WRAP_VALUE(CFE_ES_HK_TLM_MID), {0, 0}, 4},
@@ -74,6 +76,28 @@ TO_LAB_Subs_t TO_LAB_Subs = {.Subs = {/* CFS App Subscriptions */
                                       {CFE_SB_MSGID_WRAP_VALUE(CFE_ES_APP_TLM_MID), {0, 0}, 4},
                                       {CFE_SB_MSGID_WRAP_VALUE(CFE_ES_MEMSTATS_TLM_MID), {0, 0}, 4},
 
+#ifdef HAVE_CI_LAB
+                                      {CFE_SB_MSGID_WRAP_VALUE(CI_LAB_HK_TLM_MID), {0, 0}, 4},
+#endif
+#ifdef HAVE_SAMPLE_APP
+                                      {CFE_SB_MSGID_WRAP_VALUE(SAMPLE_APP_HK_TLM_MID), {0, 0}, 4},
+#endif
+#ifdef HAVE_HS_APP
+                                      {CFE_SB_MSGID_WRAP_VALUE(HS_HK_TLM_MID), {0, 0}, 4},
+#endif
+#ifdef HAVE_HS_APP
+                                      {CFE_SB_MSGID_WRAP_VALUE(FM_HK_TLM_MID), {0, 0}, 4},
+#endif
+#ifdef HAVE_HS_APP
+                                      {CFE_SB_MSGID_WRAP_VALUE(SC_HK_TLM_MID), {0, 0}, 4},
+#endif
+#ifdef HAVE_HS_APP
+                                      {CFE_SB_MSGID_WRAP_VALUE(DS_HK_TLM_MID), {0, 0}, 4},
+#endif
+#ifdef HAVE_HS_APP
+                                      {CFE_SB_MSGID_WRAP_VALUE(LC_HK_TLM_MID), {0, 0}, 4},
+#endif
+
                                       /* CFE_SB_MSGID_RESERVED entry to mark the end of valid MsgIds */
                                       {CFE_SB_MSGID_RESERVED, {0, 0}, 0}}};