Compiled on RPI3B with 6.1.25-piCore-v7

Compile Flags:
CPPFLAGS='-DNDEBUG'
CFLAGS='-march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -L/usr/local/lib -Os -pipe -flto -fuse-linker-plugin -fno-exceptions'
CXXFLAGS='-march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -L/usr/local/lib -Os -pipe -flto -fuse-linker-plugin -fno-exceptions -fno-rtti'
LDFLAGS='-Wl,-rpath=/usr/local/lib -Wl,-O1'
export CPPFLAGS CFLAGS CXXFLAGS LDFLAGS

Dependencies:
compiletc
libxml2-dev
llvm15-bin

Commands:

wget https://github.com/nghttp2/nghttp2/releases/download/v1.55.1/nghttp2-1.55.1.tar.xz

tar -xf nghttp2-1.55.1.tar.gz

cd nghttp2-1.55.1/

# There's something buggy with '--enable-lib-only', so we'll remove the redundent files manually
./configure --prefix=/usr/local --localstatedir=/var

time make -j4
real    0m 26.98s
user    0m 44.43s
sys     0m 4.18s

DESTDIR=/tmp/packing-nghttp2 make install

llvm-strip --strip-debug /tmp/packing-nghttp2/usr/local/lib/libnghttp2.a
strip --strip-unneeded /tmp/packing-nghttp2/usr/local/lib/libnghttp2.so.14.*

# dev
mkdir -p /tmp/packing-nghttp2-dev/usr/local/lib
mv /tmp/packing-nghttp2/usr/local/lib/pkgconfig /tmp/packing-nghttp2-dev/usr/local/lib
mv /tmp/packing-nghttp2/usr/local/lib/*a /tmp/packing-nghttp2-dev/usr/local/lib
mv /tmp/packing-nghttp2/usr/local/include /tmp/packing-nghttp2-dev/usr/local/

# main
cd /tmp/packing-nghttp2
rm -fr ./usr/local/bin ./usr/local/share/man ./usr/local/share/doc

======================================================================================================================

    Package version: 1.55.1
    Library version: 38:3:24
    Install prefix:  /usr/local
    System types:
      Build:         armv7l-unknown-linux-gnueabihf
      Host:          armv7l-unknown-linux-gnueabihf
      Target:        armv7l-unknown-linux-gnueabihf
    Compiler:
      C compiler:     gcc
      CFLAGS:         -march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -L/usr/local/lib -Os -pipe -flto -fuse-linker-plugin -fno-exceptions
      LDFLAGS:        -Wl,-rpath=/usr/local/lib -Wl,-O1
      C++ compiler:   g++ -std=c++14
      CXXFLAGS:       -march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -L/usr/local/lib -Os -pipe -flto -fuse-linker-plugin -fno-exceptions -fno-rtti
      CXXCPP:         g++ -E -std=c++14
      C preprocessor: gcc -E
      CPPFLAGS:       -DNDEBUG
      WARNCFLAGS:
      WARNCXXFLAGS:
      CXX1XCXXFLAGS:
      EXTRACFLAG:     -fvisibility=hidden
      BPFCFLAGS:
      EXTRABPFCFLAGS:
      LIBS:
      DEFS:           -DHAVE_CONFIG_H
      EXTRA_DEFS:
    Library:
      Shared:         yes
      Static:         yes
    Libtool:
      LIBTOOL_LDFLAGS:
    Python:
      Python:         :
      PYTHON_VERSION:
    Test:
      CUnit:          no (CFLAGS='' LIBS='')
      Failmalloc:     yes
    Libs:
      OpenSSL:        no (CFLAGS='' LIBS='')
      Libxml2:        yes (CFLAGS='-I/usr/local/include/libxml2' LIBS='-L/usr/local/lib -lxml2')
      Libev:          no (CFLAGS='' LIBS='')
      Libc-ares:      no (CFLAGS='' LIBS='')
      libngtcp2:      no (CFLAGS='' LIBS='')
      libngtcp2_crypto_quictls: no (CFLAGS='' LIBS='')
      libngtcp2_crypto_boringssl: no (CFLAGS='' LIBS='')
      libnghttp3:     no (CFLAGS='' LIBS='')
      libbpf:         no (CFLAGS='' LIBS='')
      Libevent(SSL):  no (CFLAGS='' LIBS='')
      Jansson:        no (CFLAGS='' LIBS='')
      Jemalloc:       no (CFLAGS='' LIBS='')
      Zlib:           yes (CFLAGS='' LIBS='-lz')
      Systemd:        no (CFLAGS='' LIBS='')
    Third-party:
      http-parser:    no
      MRuby:          no (CFLAGS='' LIBS='')
      Neverbleed:     no
    Features:
      Applications:   no
      HPACK tools:    no
      Examples:       no
      Threading:      yes
      HTTP/3 (EXPERIMENTAL): no