gentoo eror LC_NUMERIC to default locale: No such file or directory

If you have compilation error in a emerge process, or this message at run: locale

locale: Cannot set LC_CTYPE to default locale: No such file or directory

Fix:
Edit /etc/locale.gen add or edit the line to adjust at we need.

Example:
es_NI ISO-8859-1
es_NI UTF-8

es = languaje
NI = Country

UTF-8 or ISO-8859-1 = is de character code page.

now just run: locale-gen

Problem solved.