diff --git a/Auxiliary/bash-completion/cmake b/Auxiliary/bash-completion/cmake
index 59e02987b..557f243e3 100644
--- a/Auxiliary/bash-completion/cmake
+++ b/Auxiliary/bash-completion/cmake
@@ -3,7 +3,14 @@
 _cmake()
 {
     local cur prev words cword split=false
-    _init_completion -n := || return
+    if type -t _init_completion >/dev/null; then
+        _init_completion -n = || return
+    else
+        # manual initialization for older bash completion versions
+        COMPREPLY=()
+        cur="${COMP_WORDS[COMP_CWORD]}"
+        prev="${COMP_WORDS[COMP_CWORD-1]}"
+    fi
 
     # Workaround for options like -DCMAKE_BUILD_TYPE=Release
     local prefix=
diff --git a/Auxiliary/bash-completion/cpack b/Auxiliary/bash-completion/cpack
index 9ab604839..05e0e93ec 100644
--- a/Auxiliary/bash-completion/cpack
+++ b/Auxiliary/bash-completion/cpack
@@ -3,7 +3,14 @@
 _cpack()
 {
     local cur prev words cword
-    _init_completion -n = || return
+    if type -t _init_completion >/dev/null; then
+        _init_completion -n = || return
+    else
+        # manual initialization for older bash completion versions
+        COMPREPLY=()
+        cur="${COMP_WORDS[COMP_CWORD]}"
+        prev="${COMP_WORDS[COMP_CWORD-1]}"
+    fi
 
     case "$prev" in
         -G)
diff --git a/Auxiliary/bash-completion/ctest b/Auxiliary/bash-completion/ctest
index 327e12c59..387672adf 100644
--- a/Auxiliary/bash-completion/ctest
+++ b/Auxiliary/bash-completion/ctest
@@ -3,7 +3,14 @@
 _ctest()
 {
     local cur prev words cword
-    _init_completion -n = || return
+    if type -t _init_completion >/dev/null; then
+        _init_completion -n = || return
+    else
+        # manual initialization for older bash completion versions
+        COMPREPLY=()
+        cur="${COMP_WORDS[COMP_CWORD]}"
+        prev="${COMP_WORDS[COMP_CWORD-1]}"
+    fi
 
     case "$prev" in
         -C|--build-config)