Add legacy mode to avoid Term::ANSIColor dependency on RHEL-6

packaging/template.spec

 %if ( 0%{?rhel} && 0%{?rhel} < 7 ) || ( 0%{?centos} && 0%{?centos} < 7 )
 %global pspkg procps
+%global legacy true
 %else
 %global pspkg procps-ng
+%global legacy false
 %endif
 
 Name:           __MKIT_PROJ_PKGNAME__
 %package sh-coerce
 Summary: Shellfu/sh module with data coercion helpers
 Requires: perl
+%if %{legacy} == "false"
 Requires: perl-Term-ANSIColor
+%endif
 Requires: shellfu-sh
 %description sh-coerce
 This sub-package contains 'coerce', Shellfu module containing few
 
 %prep
 %setup -q
+/bin/sed -i '/^__COERCE__LEGACY=/s/:-false/:-%{legacy}/' ./src/include-sh/coerce.sh
+
 
 %build
 make %{?_smp_mflags} PREFIX=/usr

src/include-sh/coerce.sh

     #
     # Remove ANSI color codes
     #
-    perl -CS -Mutf8 -MTerm::ANSIColor=colorstrip -ne 'print colorstrip $_;'
+    if $__COERCE__LEGACY; then
+        sed 's/\x1b\[[0-9;]*m//g'
+    else
+        perl -CS -Mutf8 -MTerm::ANSIColor=colorstrip -ne 'print colorstrip $_;'
+    fi
 }
 
 coerce__noctl() {
     perl -CS -Mutf8 -pe "tr/$(__coerce__for_yaml_bad)/$COERCE__REPCHAR/"
 }
 
+#
+# Legacy mode
+#
+# If 'true', avoids using Term::ANSIColor in favor of a local hacky
+# sed expression yanked from stackoverflow.  Use if Term::ANSIColor
+# is not available (as is case of eg. RHEL-6).
+#
+__COERCE__LEGACY=${__COERCE__LEGACY:-false}
+
 __coerce__for_yaml_bad() {
     #
     # Print all YAML-bad chars