The NEON instructions have changed somewhat on aarch64 (arm64) and don't build when enabled on 1.2.x 

The error is:

make[3]: Leaving directory `/builddir/build/BUILD/gst-plugins-base-1.2.2/gst/audioconvert'
/bin/sh ../../libtool  --tag=CC --tag=disable-static  --mode=compile gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I../..    -I../../gst-libs -I../../gst-libs -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include   -pthread -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include   -DG_THREADS_MANDATORY -DG_DISABLE_CAST_CHECKS -DG_DISABLE_ASSERT -Wall -Wdeclaration-after-statement -Wvla -Wpointer-arith -Wmissing-declarations -Wmissing-prototypes -Wredundant-decls -Wundef -Wwrite-strings -Wformat-nonliteral -Wformat-security -Winit-self -Wmissing-include-dirs -Waddress -Waggregate-return -Wno-multichar -Wnested-externs   -g    -pthread -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include   -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches  -fno-stack-protector -c -o libgsttcp_la-gsttcpclientsink.lo `test -f 'gsttcpclientsink.c' || echo './'`gsttcpclientsink.c
libtool: compile:  gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I../.. -pthread -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -DG_THREADS_MANDATORY -DG_DISABLE_CAST_CHECKS -DG_DISABLE_ASSERT -Wall -Wdeclaration-after-statement -Wvla -Wpointer-arith -Wmissing-declarations -Wmissing-prototypes -Wredundant-decls -Wundef -Wwrite-strings -Wformat-nonliteral -Wformat-security -Winit-self -Wmissing-include-dirs -Waddress -Waggregate-return -Wno-multichar -Wnested-externs -g -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -fno-stack-protector -c mpl2parse.c  -fPIC -DPIC -o .libs/libgstsubparse_la-mpl2parse.o
libtool: compile:  gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I../.. -I../../gst-libs -I../../gst-libs -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -pthread -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -DG_THREADS_MANDATORY -DG_DISABLE_CAST_CHECKS -DG_DISABLE_ASSERT -Wall -Wdeclaration-after-statement -Wvla -Wpointer-arith -Wmissing-declarations -Wmissing-prototypes -Wredundant-decls -Wundef -Wwrite-strings -Wformat-nonliteral -Wformat-security -Winit-self -Wmissing-include-dirs -Waddress -Waggregate-return -Wno-multichar -Wnested-externs -g -pthread -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -fno-stack-protector -c gsttcpclientsink.c  -fPIC -DPIC -o .libs/libgsttcp_la-gsttcpclientsink.o
In file included from resample.c:144:0,
                 from speex_resampler_float.c:27:
resample.c: In function 'resampler_basic_direct_single':
resample_neon.h:148:5: error: impossible constraint in 'asm'
     asm volatile ("  cmp %[len], #0\n"
     ^