Description - Mks.com

If string is empty, macro is assigned the null string (unless you use the += operator; in this case,
the macros contents are not touched). White space on either side of the =, :=, or += is ignored.
Macros are expanded by $(macro) or ${macro}. If a macro name is a single letter, it can also be
expanded by $n, where n is the name.
If the .BRACEEXPAND special target is set, make expands a token sequence (separated by white
space) prepending a prefix string and appending a suffix string to each token:
string1{ token-list }string2
Future versions of MKS Make may not support this obsolescent feature.
A macro can also be modified as it is expanded. The syntax for this is
$(macro {:modifier})
where any number of modifiers can be supplied, separated by :.
modifier
→b
→d
→f
→l
→ s/string/new_string/
→ suffix_string=new_suffix_string
→ t"string"
→u
→^"string"
→+"string"
The :s modifier is a substitute operator; occurrences of the given pattern that are matched are
replaced by the indicated value. The :t modifier tokenizes the macro string definition, placing the
given string between each name in the indicated string. That string may contain the following
escape sequences:
\" → "
\\ → \
\a → alert or
\b →
\f →
\n →
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