• Glibc: LTO-x (safe: -march=native -O3 -pipe)
• TCL: LTO-x (safe: -march=native -O3 -pipe)
• libtool: LTO-x (safe: -march=native -O3 -pipe)
• OpenSSL: LTO-x (safe: -march=native -O3 -pipe)
• Linux-6.18.10: LTO-x, O3-x (safe: -march=native -O2 -pipe)

gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/15.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --prefix=/usr LD=ld \
--enable-languages=c,c++ --enable-default-pie --enable-default-ssp \
--enable-host-pie --disable-multilib --disable-bootstrap \
--disable-fixincludes --with-system-zlib --with-isl --enable-lto
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.2.0 (GCC)

pinentry-1.3.2

sed -i "/FLTK 1/s/3/4/" configure   &&
## sed -i '14456 s/1.3/1.4/' configure
sed -i '14466 's/1.3/1.4/' configure