diff --git a/cinelerra-5.1/cinelerra/Makefile b/cinelerra-5.1/cinelerra/Makefile
index 81d1acee..b3d519ad 100644
--- a/cinelerra-5.1/cinelerra/Makefile
+++ b/cinelerra-5.1/cinelerra/Makefile
@@ -396,7 +396,7 @@ OBJS += \
 endif
 ifneq ($(WANT_CIN_3RDPARTY),no)
 OBJS += \
-	$(OBJDIR)/fileac3.o \
+#	$(OBJDIR)/fileac3.o \
 
 endif
 
diff --git a/cinelerra-5.1/cinelerra/ffmpeg.C b/cinelerra-5.1/cinelerra/ffmpeg.C
index df39763c..c32ae50e 100644
--- a/cinelerra-5.1/cinelerra/ffmpeg.C
+++ b/cinelerra-5.1/cinelerra/ffmpeg.C
@@ -29,7 +29,7 @@
 #include "ffmpeg.h"
 #include "indexfile.h"
 #include "interlacemodes.h"
-#include "libdv.h"
+//#include "libdv.h"
 #include "libmjpeg.h"
 #include "mainerror.h"
 #include "mwindow.h"
diff --git a/cinelerra-5.1/cinelerra/fileffmpeg.C b/cinelerra-5.1/cinelerra/fileffmpeg.C
index a71d692a..853e5839 100644
--- a/cinelerra-5.1/cinelerra/fileffmpeg.C
+++ b/cinelerra-5.1/cinelerra/fileffmpeg.C
@@ -159,7 +159,7 @@ void FFMpegPixelFormat::update_formats()
 	pixfmts.remove_all_objects();
 	char video_codec[BCSTRLEN]; video_codec[0] = 0;
 	const char *vcodec = vid_config->asset->vcodec;
-	AVCodec *av_codec = !FFMPEG::get_codec(video_codec, "video", vcodec) ?
+	const AVCodec *av_codec = !FFMPEG::get_codec(video_codec, "video", vcodec) ?
 		avcodec_find_encoder_by_name(video_codec) : 0;
 	const AVPixelFormat *pix_fmts = av_codec ? av_codec->pix_fmts : 0;
 	if( pix_fmts ) {
@@ -190,7 +190,7 @@ void FFMpegSampleFormat::update_formats()
 	samplefmts.remove_all_objects();
 	char audio_codec[BCSTRLEN]; audio_codec[0] = 0;
 	const char *acodec = aud_config->asset->acodec;
-	AVCodec *av_codec = !FFMPEG::get_codec(audio_codec, "audio", acodec) ?
+	const AVCodec *av_codec = !FFMPEG::get_codec(audio_codec, "audio", acodec) ?
 		avcodec_find_encoder_by_name(audio_codec) : 0;
 	const AVSampleFormat *sample_fmts = av_codec ? av_codec->sample_fmts : 0;
 	if( sample_fmts ) {
@@ -345,7 +345,7 @@ int FileFFMPEG::open_file(int rd, int wr)
 				asset->aspect_ratio = ff->ff_aspect_ratio(0);
 				if (!asset->interlace_mode) asset->interlace_mode = ff->ff_interlace(0);
 				if ( ff->ff_video_frames(0) > 1 ) {
-//				ff->video_probe(1);
+				ff->video_probe(1);
 				 if (!asset->interlace_mode && (ff->interlace_from_codec) ) asset->interlace_mode = ff->video_probe(1); 
 				}
 				if( !asset->layers ) asset->layers = video_layers;
@@ -1844,7 +1844,7 @@ int FFOptionsViewAudio::handle_event()
 	const char *name = asset->acodec;
 	char audio_format[BCSTRLEN];  audio_format[0] = 0;
 	char audio_codec[BCSTRLEN];   audio_codec[0] = 0;
-	AVCodec *codec = !ret &&
+	const AVCodec *codec = !ret &&
 	    !FFMPEG::get_format(audio_format, "audio", name) &&
 	    !FFMPEG::get_codec(audio_codec, "audio", name) ?
 		avcodec_find_encoder_by_name(audio_codec) : 0;
@@ -1882,7 +1882,7 @@ int FFOptionsViewVideo::handle_event()
 	const char *name = asset->vcodec;
 	char video_format[BCSTRLEN];  video_format[0] = 0;
 	char video_codec[BCSTRLEN];   video_codec[0] = 0;
-	AVCodec *codec = !ret &&
+	const AVCodec *codec = !ret &&
 	    !FFMPEG::get_format(video_format, "video", name) &&
 	    !FFMPEG::get_codec(video_codec, "video", name) ?
 		avcodec_find_encoder_by_name(video_codec) : 0;
diff --git a/cinelerra-5.1/cinelerra/record.C b/cinelerra-5.1/cinelerra/record.C
index ad293f7b..17a75302 100644
--- a/cinelerra-5.1/cinelerra/record.C
+++ b/cinelerra-5.1/cinelerra/record.C
@@ -46,7 +46,7 @@
 #include "keys.h"
 #include "language.h"
 #include "localsession.h"
-#include "libdv.h"
+//#include "libdv.h"
 #include "libmjpeg.h"
 #include "libzmpeg3.h"
 #include "mainmenu.h"
@@ -217,7 +217,7 @@ int Record::load_defaults()
 		break;
 	case CAPTURE_FIREWIRE:
 	case CAPTURE_IEC61883:
-		vcodec = CODEC_TAG_DVSD;
+		//vcodec = CODEC_TAG_DVSD;
 		break;
 	}
 	if( vcodec )
diff --git a/cinelerra-5.1/configure.ac b/cinelerra-5.1/configure.ac
index ceddac2a..f28120c1 100644
--- a/cinelerra-5.1/configure.ac
+++ b/cinelerra-5.1/configure.ac
@@ -1,11 +1,11 @@
 
-AC_PREREQ([2.69])
-AC_INIT([cinelerra], [5.1], [mail@lists.cinelerra-gg.org])
+AC_PREREQ([2.71])
+AC_INIT([cinelerra],[5.1],[mail@lists.cinelerra-gg.org])
 AM_INIT_AUTOMAKE([foreign])
 
 AM_PROG_AS
-AC_LANG_CPLUSPLUS
-AC_LANG_C
+AC_LANG([C++])
+AC_LANG([C])
 AC_PROG_CXX
 
 CFG_CFLAGS+=" -fno-omit-frame-pointer -fno-math-errno -fno-signed-zeros"
@@ -24,14 +24,15 @@ CFG_CFLAGS+=" -D__STDC_CONSTANT_MACROS"
 CFG_CFLAGS+=" -D__STDC_LIMIT_MACROS"
 CFG_CFLAGS+=" -DPNG_SKIP_SETJMP_CHECK=1"
 CFG_CFLAGS+=" -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64"
-CFG_CFLAGS+=" -I/usr/include -I/usr/local/include"
+# CFG_CFLAGS+=" -I/usr/include -I/usr/local/include"
+CFG_CFLAGS+=" -I/data/data/com.termux/files/usr/include/freetype2"
 CFG_CFLAGS+=" -I/usr/include/freetype2 -I/usr/local/include/freetype2"
-CFG_CFLAGS+=" -I/usr/include/uuid -I/usr/local/include/uuid"
+CFG_CFLAGS+=" -I/data/data/com.termux/files/usr/include/uuid -I/usr/local/include/uuid"
 CFG_CFLAGS+=" -I/usr/include/mjpegtools -I/usr/local/include/mjpegtools"
 
 AC_DEFUN([CHECK_WITH], [
 AC_ARG_WITH([$1],
-  AC_HELP_STRING([--with-[$1]], [$2 ($4)]),
+  AS_HELP_STRING([--with-[$1]],[$2 ($4)]),
   [WANT_$3=$withval], [WANT_$3='$4'])
 AC_SUBST([WANT_$3])
 ])
@@ -64,6 +65,45 @@ CHECK_WITH([nv],[nvenc/nvdec ffnvcodec api],[NV],[yes])
 CHECK_WITH([cuda],[nv cuda plugins],[CUDA],[auto])
 CHECK_WITH([clang],[use clang instead of gcc/g++],[CLANG],[no])
 
+# Checks for header files.
+AC_PATH_X
+AC_CHECK_HEADERS([arpa/inet.h fcntl.h fenv.h inttypes.h libintl.h malloc.h mntent.h netdb.h netinet/in.h stdint.h strings.h sys/file.h sys/ioctl.h sys/socket.h sys/statfs.h sys/time.h unistd.h utime.h])
+
+# Checks for typedefs, structures, and compiler characteristics.
+AC_CHECK_HEADER_STDBOOL
+AC_C_INLINE
+AC_TYPE_INT16_T
+AC_TYPE_INT32_T
+AC_TYPE_INT64_T
+AC_TYPE_INT8_T
+AC_TYPE_OFF_T
+AC_TYPE_PID_T
+AC_TYPE_SIZE_T
+AC_TYPE_SSIZE_T
+AC_CHECK_MEMBERS([struct stat.st_blksize])
+AC_STRUCT_ST_BLOCKS
+AC_CHECK_MEMBERS([struct stat.st_rdev])
+AC_TYPE_UINT16_T
+AC_TYPE_UINT32_T
+AC_TYPE_UINT64_T
+AC_TYPE_UINT8_T
+
+# Checks for library functions.
+AC_FUNC_ALLOCA
+AC_FUNC_ERROR_AT_LINE
+AC_FUNC_FORK
+AC_FUNC_FSEEKO
+AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK
+AC_FUNC_MALLOC
+AC_FUNC_MKTIME
+AC_FUNC_MMAP
+AC_FUNC_REALLOC
+AC_FUNC_STRERROR_R
+AC_FUNC_STRNLEN
+AC_FUNC_STRTOD
+AC_CHECK_FUNCS([atexit bzero dup2 endpwent floor ftruncate getcwd gethostbyname gettimeofday inet_ntoa localtime_r memmove memset mkdir mkfifo modf munmap nl_langinfo pow putenv realpath rint rmdir select setenv setlocale socket sqrt strcasecmp strchr strdup strerror strncasecmp strrchr strstr strtol strtoul tzset uname utime])
+
+
 if test "x$WANT_LV2" != "xno"; then
   GTK2_LIBS=`pkg-config --libs gtk+-2.0`
   AC_CHECK_LIB([m], [gtk_init], [HAVE_gtk=yes], [HAVE_gtk=no], [$GTK2_LIBS])
@@ -153,7 +193,7 @@ inc_$1="$4"
 
 AC_DEFUN([PKG_3RD],[
 AC_ARG_ENABLE([$1],
-  AC_HELP_STRING([--enable-$1],[build $1 ($2)]),
+  AS_HELP_STRING([--enable-$1],[build $1 ($2)]),
   [PKG_$1=$enableval], [PKG_$1=$2])
 PKG_DEF([$1],[$3],[$4],[$5])
 ])
@@ -432,7 +472,7 @@ AC_SUBST(STATIC_PKGS)
 
 AC_DEFUN([CHECK_ENABLE], [
 AC_ARG_ENABLE([$1],
-  AC_HELP_STRING([--enable-[$1]], [$3 ([$4])]),
+  AS_HELP_STRING([--enable-[$1]],[$3 ([$4])]),
   [WANT_$2=$enableval], [WANT_$2=[$4]])
 ])
 
@@ -615,7 +655,7 @@ AC_DEFUN([CHECK_WANT], [
 RESULT=yes
 # WANT_$1
 AC_ARG_WITH(m4_tolower([$1]),
- AC_HELP_STRING([m4_join([-],[--with],m4_tolower([$1]))], [$3] (auto)),
+ AS_HELP_STRING([m4_join([-],[--with],m4_tolower([$1]))],[$3 (auto)]),
   [WANT_$1=$withval],[WANT_$1=$2])
  m4_quote($4)
  if test "x$WANT_$1" = "xauto" ; then
@@ -821,14 +861,14 @@ HAVE_ilmbase=no \
 OBJDIR=`uname -m`
 AC_SUBST(OBJDIR)
 
-echo "AC_HELP_STRING([Reason],[Package])"
-echo "AC_HELP_STRING([------],[-------])"
+echo "AS_HELP_STRING([Reason],[Package])"
+echo "AS_HELP_STRING([------],[-------])"
 
 AC_DEFUN([PKG_DISABLED],[
  PKG_$1="no"
  BUILD_$1=0
  AC_SUBST(BUILD_$1)
- echo "AC_HELP_STRING([disabled],[$1])"
+ echo "AS_HELP_STRING([disabled],[$1])"
 ])
 AC_DEFUN([PKG_SHARED],[
  PKG_$1="shared"
@@ -843,7 +883,7 @@ AC_DEFUN([PKG_STATIC],[
   BUILD_$1=1
   AC_SUBST(BUILD_$1)
   STATIC_BLDS+=" [$1]"
-  echo "AC_HELP_STRING([$2],[$1])"
+  echo "AS_HELP_STRING([$2],[$1])"
  fi
 ])
 
@@ -937,11 +977,11 @@ fi
 
 AC_SUBST(STATIC_BLDS)
 for f in $SHARED_LIBS; do
-  echo "AC_HELP_STRING([shared],[$f])"
+  echo "AS_HELP_STRING([shared],[$f])"
 done
 AC_SUBST(SHARED_LIBS)
 for f in $SYSTEM_LIBS; do
-  echo "AC_HELP_STRING([system],[$f])"
+  echo "AS_HELP_STRING([system],[$f])"
 done
 AC_SUBST(SYSTEM_LIBS)
 
diff --git a/cinelerra-5.1/db/tdb.h b/cinelerra-5.1/db/tdb.h
index 8ee88002..d3f0a51a 100644
--- a/cinelerra-5.1/db/tdb.h
+++ b/cinelerra-5.1/db/tdb.h
@@ -223,32 +223,32 @@ public:
     pageId id;
     int offset;
   };
-
+#if 1
   static void zincr(volatile int &v) { /* atomic(++v) */
-    asm ( " lock incl %1\n" : "+m" (v) :: );
+    //asm ( " lock incl %1\n" : "+m" (v) :: );
   }
   static void zdecr(volatile int &v) { /* atomic(--v) */
-    asm ( " lock decl %1\n" : "+m" (v) :: );
+    //asm ( " lock decl %1\n" : "+m" (v) :: );
   }
   static char tdecr(volatile int &v) {
     char ret; /* ret = atomic(--loc >= 0 ? 1 : 0) */
-    asm ( " lock decl %1\n setge %0\n" : "=r" (ret), "+m" (v) :: );
+    //asm ( " lock decl %1\n setge %0\n" : "=r" (ret), "+m" (v) :: );
     return ret;
   }
   static char tincr(volatile int &v) {
     char ret; /* ret = atomic(++loc > 0 ? 1 : 0) */
-    asm ( " lock incl %1\n setg %0\n" : "=r" (ret), "+m" (v) :: );
+    //asm ( " lock incl %1\n setg %0\n" : "=r" (ret), "+m" (v) :: );
     return ret;
   }
   static int zcmpxchg(int old, int val, volatile int &v) {
     int ret = old;
-    asm volatile( " lock\n cmpxchgl %2,%1\n"
-      : "+a" (ret), "+m" (v) :  "r" (val) : "memory" );
+    // asm volatile( " lock\n cmpxchgl %2,%1\n"
+     // : "+a" (ret), "+m" (v) :  "r" (val) : "memory" );
     return ret;
   }
   static int zxchg(int val, volatile int &v) {
-    asm volatile( " xchgl %0,%1\n"
-      : "+r" (val), "+m" (v) :: "memory" );
+    //asm volatile( " xchgl %0,%1\n"
+    //  : "+r" (val), "+m" (v) :: "memory" );
     return val;
   }
   static int zadd(int n, volatile int &v) {
@@ -258,8 +258,9 @@ public:
     return val;
   }
   static void zmfence() {
-    asm volatile ( " mfence\n" ::: "memory" );
+    //asm volatile ( " mfence\n" ::: "memory" );
   }
+#endif // asm
 
   class zlock_t;
   class zblock_t;
diff --git a/cinelerra-5.1/guicast/Makefile b/cinelerra-5.1/guicast/Makefile
index cf189dea..762e7ea8 100644
--- a/cinelerra-5.1/guicast/Makefile
+++ b/cinelerra-5.1/guicast/Makefile
@@ -12,6 +12,16 @@ ifeq ($(OBJDIR), amd64)
 BOOTSTRAPFLAGS := -DBOOTSTRAP="\"objcopy -B i386 -I binary -O elf64-x86-64\""
 endif
 
+ifeq ($(OBJDIR), armv8l)
+BOOTSTRAPFLAGS := -DBOOTSTRAP="\"objcopy -B arm -I binary -O elf32-littlearm\""
+endif
+
+
+
+
+
+
+
 $(shell mkdir -p $(OBJDIR) )
 
 OBJS = \
diff --git a/cinelerra-5.1/guicast/filesystem.C b/cinelerra-5.1/guicast/filesystem.C
index 6017f6ea..f45b562e 100644
--- a/cinelerra-5.1/guicast/filesystem.C
+++ b/cinelerra-5.1/guicast/filesystem.C
@@ -536,7 +536,7 @@ int FileSystem::parse_tildas(char *new_dir)
 				new_user[j] = new_dir[i];
 			}
 			new_user[j] = 0;
-
+#if 0
 			setpwent();
 			while( (pw = getpwent()) != 0 )
 			{
@@ -550,6 +550,7 @@ int FileSystem::parse_tildas(char *new_dir)
       			}
 			}
 			endpwent();
+#endif
 			return 0;
 		}
 	}
diff --git a/cinelerra-5.1/guicast/thread.C b/cinelerra-5.1/guicast/thread.C
index 50b52a47..e5874c7f 100644
--- a/cinelerra-5.1/guicast/thread.C
+++ b/cinelerra-5.1/guicast/thread.C
@@ -28,6 +28,7 @@
 #include <string.h>
 #include <typeinfo>
 #include "thread.h"
+#include "bthread.h"
 
 
 Thread::Thread(int synchronous, int realtime, int autodelete)
@@ -102,7 +103,7 @@ void Thread::start()
 			perror("Thread::start pthread_attr_setschedparam");
 	}
 	else {
-		if(pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED) < 0)
+		//if(pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED) < 0)
 			perror("Thread::start pthread_attr_setinheritsched");
 	}
 
diff --git a/cinelerra-5.1/guicast/thread.h b/cinelerra-5.1/guicast/thread.h
index 79f3e713..bec2509d 100644
--- a/cinelerra-5.1/guicast/thread.h
+++ b/cinelerra-5.1/guicast/thread.h
@@ -29,13 +29,15 @@
 #ifndef NO_TID
 #include <sys/syscall.h>
 
+#if defined(__GLIBC__)
 // glibc >= 2.30 provides gettid() in unistd
 #if !defined(__GLIBC_PREREQ) || !__GLIBC_PREREQ(2, 30)
 static inline int gettid() { return syscall(SYS_gettid, 0, 0, 0); }
 #endif
 #else
-static inline long gettid() { return (long)pthread_self(); }
+//static inline long gettid() { return (long)pthread_self(); }
 #endif
+#endif // GLIBC
 
 // The thread does not autodelete by default.
 // If autodelete is 1 the thread autodeletes.
diff --git a/cinelerra-5.1/guicast/vframe.C b/cinelerra-5.1/guicast/vframe.C
index af0e52a8..44d7f97e 100644
--- a/cinelerra-5.1/guicast/vframe.C
+++ b/cinelerra-5.1/guicast/vframe.C
@@ -334,7 +334,7 @@ if( memory_type != VFrame::SHARED )
 			shmid = -1;
 			break;
 
-		case VFrame::SHMGET:
+		case VFrame::SHM_GET:
 			if(data)
 				shmdt(data);
 			data = 0;
@@ -510,7 +510,7 @@ int VFrame::allocate_data(unsigned char *data, int shmid,
 		this->v_offset = v_offset;
 	}
 	else if( shmid >= 0 ) {
-		memory_type = VFrame::SHMGET;
+		memory_type = VFrame::SHM_GET;
 		this->data = (unsigned char*)shmat(shmid, NULL, 0);
 		if( this->data == (unsigned char*)-1 ) {
 			printf("VFrame::allocate_data %d could not attach"
@@ -593,7 +593,7 @@ void VFrame::set_memory(unsigned char *data,
 	else
 	if(shmid >= 0)
 	{
-		memory_type = VFrame::SHMGET;
+		memory_type = VFrame::SHM_GET;
 		this->data = (unsigned char*)shmat(shmid, NULL, 0);
 		this->shmid = shmid;
 	}
@@ -635,7 +635,7 @@ void VFrame::set_compressed_memory(unsigned char *data,
 	else
 	if(shmid >= 0)
 	{
-		memory_type = VFrame::SHMGET;
+		memory_type = VFrame::SHM_GET;
 		this->data = (unsigned char*)shmat(shmid, NULL, 0);
 		this->shmid = shmid;
 	}
@@ -713,7 +713,7 @@ UNBUFFER(data);
 			else
 				free(data);
 		}
-		else if( memory_type == VFrame::SHMGET ) {
+		else if( memory_type == VFrame::SHM_GET ) {
 			if( data ) shmdt(data);
 		}
 
diff --git a/cinelerra-5.1/guicast/vframe.h b/cinelerra-5.1/guicast/vframe.h
index 589fce1c..dbaf9fba 100644
--- a/cinelerra-5.1/guicast/vframe.h
+++ b/cinelerra-5.1/guicast/vframe.h
@@ -31,6 +31,8 @@
 #include "bccmodels.h"
 #include "vframe.inc"
 
+#include <sys/shm.h>
+
 // Maximum number of prev or next effects to be pushed onto the stacks.
 #define MAX_STACK_ELEMENTS 255
 #define SHM_MIN_SIZE 2048
@@ -417,7 +419,7 @@ private:
 	{
 		PRIVATE,
 		SHARED,
-		SHMGET
+		SHM_GET
 	};
 
 // Data pointer is pointing to someone else's buffer.