Building libraries(for QMYSQL driver) on new versions of NDK(r18b)

MazyCrazy

Hello.
I'm new to Android development.
I need to build QMYSQL dirver for Android. I found a detailed and working guide how to do it for Android NDK r10e. The problem is that I use Qt 5.12.3 that only works with recent versions of the Android NDK, for example r18b. In this and newer versions, the file structure has been greatly changed, and now I cannot find the headers, libraries and programs I need.

Here are the variables that I need to declare to successfully build all the libraries (libiconv, OpenSSL, MariaDB):
Code (Text):

export ANDROID_NDK_ROOT=/c/android-ndk-r10e
export SR="$ANDROID_NDK_ROOT"/platforms/android-19/arch-arm
export BR="$ANDROID_NDK_ROOT"/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-
export CPP="$BR"cpp
export AR="$BR"ar
export STRIP="$BR"strip
export RANLIB="$BR"ranlib
export LINKER="$BR"ld
export OBJDUMP="$BR"objdump
export CC="$BR"gcc
export CFLAGS="--sysroot=$SR"
export CPPFLAGS="$CFLAGS"
export C_INCLUDE_PATH=$SR/include
export ANDROID_DEV=$SR/usr
export MAKEDEPPROG="$CC -M"

About problem, for example, in the $BR folder there are no more necessary compiler programs, and there are no headers in the $SR folder.
Note: $SR - "sysroot", $BR - common path to binaries in old Anroid NDK versions.

Thanks for help.

(russian guide that I used: http://pavelk.ru/android-mysql-qmysql-dlya-qt5-6-na-windows-i-linux-kompilyaciya)