# _b4_define_flag_if($1, $2, FLAG)
# --------------------------------
# Work around the impossibility to define macros inside macros,
-# because issuing `[$1]' is not possible in M4. GNU M4 should provide
+# because issuing '[$1]' is not possible in M4. GNU M4 should provide
# $$1 a la M5/TeX.
m4_define([_b4_define_flag_if],
[m4_if([$1$2], $[1]$[2], [],
# b4_percent_define_if_define(NAME, [VARIABLE = NAME])
# ----------------------------------------------------
# Define b4_NAME_if that executes its $1 or $2 depending whether
-# VARIABLE was %defined. The characters `.' and `-' in VARIABLE are mapped
-# to `_'.
+# VARIABLE was %defined. The characters '.' and `-' in VARIABLE are mapped
+# to '_'.
m4_define([b4_percent_define_if_define_],
[m4_define(m4_bpatsubst([b4_$1_if], [[-.]], [_]),
[b4_percent_define_flag_if(m4_default([$2], [$1]),