tce-load -i compiletc gtk2-dev libetpan-dev libnotify-dev.tcz libstartup-notification-dev.tcz poppler07-dev.tcz librsvg-dev libsoup-gnome-dev libarchive3-dev gpgme-dev enchant2-dev libical3-dev python3.9-dev libassuan-dev pcre-dev

wget https://www.claws-mail.org/download.php?file=releases/claws-mail-3.21.0.tar.xz

cd claws-mail-3.21.0

CC="gcc -flto -march=i486 -mtune=i686 -Os -pipe" CXX="g++ -flto -march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --localstatedir=/var --disable-static

find . -name Makefile -type f -exec sed -i 's/-g -O2//g' {} \;

make [4m 1.25s]
sudo make install

claws-mail 3.17.5

claws-mail 3.21.0

Using Address Book : Original stable interface
JPilot             : no
LDAP               : no
gnuTLS             : yes
OAuth2             : yes
iconv              : yes
compface           : no
IPv6               : yes
enchant            : yes
IMAP4              : yes
NNTP               : yes
Crash dialog       : no
LibSM              : yes
DBUS               : no
NetworkManager     : no
Manual             : no
Generic UMPC code  : no
SVG support        : yes
Config dir         : .claws-mail
Password crypto    : gnutls
Unit tests         : no
Plugins
   Built:
            - acpi_notifier
            - address_keeper
            - archive
            - att_remover
            - attachwarner
            - bogofilter
            - bsfilter
            - clamd
            - dillo
            - fetchinfo
            - keyword_warner
            - libravatar
            - mailmbox
            - managesieve
            - newmail
            - notification
                Features:
                    banner
                    command
                    hotkeys
                    lcdproc
                    libnotify
                    popup
                    trayicon
                Disabled due to missing dependencies:
                    unity/messaging-menu
                    libcanberra-gtk
            - pdf_viewer
            - perl
            - pgpcore
            - pgpmime
            - pgpinline
            - rssyl
            - spamassassin
            - smime
            - spam_report
            - vcalendar
   Disabled:
            - demo
   Disabled due to missing dependencies:
            - fancy
            - litehtml_viewer
            - python
            - tnef_parse

The binary will be installed in /usr/local/bin

claws-mail

** (claws-mail:8548): WARNING **: 09:41:59.291: failed to open directory: /usr/local/etc/skel/.claws-mail
/home/tc/.claws-mail/clawsrc: claws_fopen: No such file or directory
prefs.c:126 Condition pfile != NULL failed
traceback:
0:      claws-mail(prefs_file_close+0x67) [0x63e50f]
1:      claws-mail(plugin_load_all+0xd8) [0x63eb26]
2:      claws-mail(main+0x1647) [0x4e10e7]
3:      /lib/libc.so.6(+0x2272c) [0xb671572c]
4:      /lib/libc.so.6(+0x2286b) [0xb671586b]
5:      claws-mail(_start+0x27) [0x4e1e57]

/home/tc/.claws-mail/menurc: claws_fopen: No such file or directory

(claws-mail:8548): Claws-Mail-WARNING **: 09:41:59.291: can't copy /home/tc/.claws-mail/menurc to /home/tc/.claws-mail/menurc.bak
/home/tc/.claws-mail/addrbook/addrbook--index.xml: fopen: No such file or directory
/home/tc/.claws-mail/addrbook/addressbook.xml: fopen: No such file or directory
/home/tc/.claws-mail/toolbar_main.xml: fopen: No such file or directory