tce-load -i compiletc libmbim-dev

cd libqmi-1.20.0

CC="gcc -march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -Os -pipe" CXX="g++ -march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --localstatedir=/var --disable-static --libexecdir=/usr/local/lib/qmi

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

make [5m 44.76s]
sudo make install

    libqmi (libqmi-glib, qmicli) 1.20.0
    ==============================================

    compiler:              gcc -march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -Os -pipe
    cflags:                -Wall -std=gnu89 -g -O2 -Wmissing-declarations -Wmissing-prototypes -Wdeclaration-after-statement -Wstrict-prototypes -fno-strict-aliasing -Wno-deprecated-declarations -Wint-to-pointer-cast -Wfloat-equal -Wno-unused-parameter -Wno-sign-compare -Wunused-but-set-variable -Wundef -Wimplicit-function-declaration -Wpointer-arith -Winit-self -Wshadow -Wmissing-include-dirs -Waggregate-return -Wformat-security -Wtype-limits -Werror
    Maintainer mode:       yes
    udev base directory:   /lib/udev
    Documentation:         no
    QMI username:          no (root)
    QMUX over MBIM:        yes

    Built items:
      libqmi-glib:         yes
      qmicli:              yes
      qmi-firmware-update: yes
          with udev:             yes
          with MM runtime check: yes