https support via gnutls (solution inside)

[bubbleguuum]

Simply add code below to build.sh and add --enable-gnutls to ffmpeg's configure.

download \
  "gmp-6.1.2.tar.xz" \
  "" \
  "f58fa8001d60c4c77595fbbb62b63c1d" \
  "https://gmplib.org/download/gmp/"

download \
  "nettle-3.3.tar.gz" \
  "" \
  "10f969f78a463704ae73529978148dbe" \
  "https://ftp.gnu.org/gnu/nettle"

download \
  "gnutls-3.5.9.tar.xz" \
  "" \
  "0ab25eb6a1509345dd085bc21a387951" \
  "https://www.gnupg.org/ftp/gcrypt/gnutls/v3.5"

# must be compiled before libnettle                                                                                                                                                                                                           
echo "*** Building libgmp ***"
cd $BUILD_DIR/gmp*
[ $rebuild -eq 1 -a -f Makefile ] && make distclean || true
[ ! -f config.status ] && PATH="$BIN_DIR:$PATH" ./configure --prefix=$TARGET_DIR --bindir=$BIN_DIR --disable-shared  --with-pic
PATH="$BIN_DIR:$PATH" make -j $jval
make install

echo "*** Building libnettle ***"
cd $BUILD_DIR/nettle*
[ $rebuild -eq 1 -a -f Makefile ] && make distclean || true
[ ! -f config.status ] && PATH="$BIN_DIR:$PATH" ./configure --prefix=$TARGET_DIR --bindir=$BIN_DIR --disable-shared --enable-pic
PATH="$BIN_DIR:$PATH" make -j $jval
make install

echo "*** Building libgnutls  ***"
cd $BUILD_DIR/gnutls*
[ $rebuild -eq 1 -a -f Makefile ] && make distclean || true
[ ! -f config.status ] && PATH="$BIN_DIR:$PATH" ./configure --prefix=$TARGET_DIR --bindir=$BIN_DIR --enable-static --disable-shared --with-pic --with-included-libtasn1 --with-included-unistring --without-p11-kit --disable-doc --disable-c\
xx --disable-tools
PATH="$BIN_DIR:$PATH" make -j $jval
make install