pkg/59021: gtk3: Conversion from character set _UTF-8_ to _646_ is not supported

[mayuresh%acm.org@localhost]

>Number:         59021
>Category:       pkg
>Synopsis:       gtk3: Conversion from character set _UTF-8_ to _646_ is not supported
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 22 07:05:00 +0000 2025
>Originator:     Mayuresh
>Release:        NetBSD 10.1 pkgsrc current as of 21 Jan 2025
>Organization:
>Environment:
NetBSD warunjikar.in 10.1 NetBSD 10.1 (GENERIC) #0: Mon Dec 16 13:08:11 UTC 2024  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
https://mail-index.netbsd.org/pkgsrc-users/2025/01/19/msg040890.html

Note: x11/gtk2 also fails with different manifestation, but the fix looks same for both.
>How-To-Repeat:
cd /usr/pkgsrc/x11/gtk3
make
>Fix:
This worked for me but not sure if this is a good fix.

Note: Same fix worked for me for x11/gtk2 as well.

diff --git a/x11/gtk3/Makefile b/x11/gtk3/Makefile
index 5d12cab7b..0915cb187 100644
--- a/x11/gtk3/Makefile
+++ b/x11/gtk3/Makefile
@@ -124,3 +124,6 @@ BUILDLINK_API_DEPENDS.libepoxy+=    libepoxy>=1.4
 .include "../../lang/python/tool.mk"
 .include "../../sysutils/desktop-file-utils/desktopdb.mk"
 .include "../../mk/bsd.pkg.mk"
+
+MAKE_ENV+=     LANG=en_US.UTF-8
+MAKE_ENV+=     LC_ALL=en_US.UTF-8