diff --git a/shell/key-bindings.bash b/shell/key-bindings.bash
index 8654a6f..398f66e 100644
--- a/shell/key-bindings.bash
+++ b/shell/key-bindings.bash
@@ -56,7 +56,7 @@ if command -v perl > /dev/null; then
     output=$(
       set +o pipefail
       builtin fc -lnr -2147483648 |
-        last_hist=$(HISTTIMEFORMAT='' builtin history 1) perl -n -l0 -e "$script" |
+        last_hist=$(HISTTIMEFORMAT='' builtin history 1) command perl -n -l0 -e "$script" |
         FZF_DEFAULT_OPTS="$opts" $(__fzfcmd) --query "$READLINE_LINE"
     ) || return
     READLINE_LINE=${output#*$'\t'}
@@ -66,16 +66,14 @@ if command -v perl > /dev/null; then
       READLINE_POINT=0x7fffffff
     fi
   }
-else # awk
+else # awk - fallback for POSIX systems
   __fzf_history__() {
-    local output opts script
+    local output opts script n x y z d
     if [[ -z $__fzf_awk ]]; then
       __fzf_awk=awk
-      # if installed, mawk is faster
-      command -v mawk > /dev/null &&
-        mawk --version |          # at least 1.3.4
-          awk 'NR == 1 { split($2, a, "."); v=(a[1]*1000000+ a[2]*1000+ a[3]*1); exit !(v >= 1003004) }' &&
-          __fzf_awk=mawk
+      # choose the faster mawk if: it's installed && build date >= 20230322 && version >= 1.3.4
+      IFS=' .' read n x y z d <<< $(command mawk -W version 2> /dev/null)
+      [[ $n == mawk ]] && (( d >= 20230302 && (x *1000 +y) *1000 +z >= 1003004 )) && __fzf_awk=mawk
     fi
     opts="--height ${FZF_TMUX_HEIGHT:-40%} --bind=ctrl-z:ignore ${FZF_DEFAULT_OPTS-} -n2..,.. --scheme=history --bind=ctrl-r:toggle-sort ${FZF_CTRL_R_OPTS-} +m --read0"
     [[ $(HISTTIMEFORMAT='' builtin history 1) =~ [[:digit:]]+ ]]    # how many history entries
@@ -87,7 +85,7 @@ else # awk
     output=$(
       set +o pipefail
       builtin fc -lnr -2147483648 2> /dev/null |   # ( $'\t '<lines>$'\n' )* ; <lines> ::= [^\n]* ( $'\n'<lines> )*
-        $__fzf_awk "$script"                          |   # ( <counter>$'\t'<lines>$'\000' )*
+        command $__fzf_awk "$script"           |   # ( <counter>$'\t'<lines>$'\000' )*
         FZF_DEFAULT_OPTS="$opts" $(__fzfcmd) --query "$READLINE_LINE"
     ) || return
     READLINE_LINE=${output#*$'\t'}