- AC_PATH_PROG(SH,bash sh)
  this only checks whether bash exists in ${PATH}, not sh
  AC_PATH_PROGS() is suppose to check for each program in the blank-separated list,
  and there is no bash in the FreeBSD base system.

- AC_CHECK_TARGET_TOOLS(OBJDUMP,gobjdump objdump)
  /usr/bin/objdump (the GNU version) was removed from the FreeBSD base system
  https://cgit.freebsd.org/src/commit/?id=0ad202f312f6da4f2774ecb7a3f3c2a05b3dde5f
  add llvm-objdump to the list for ${OBJDUMP}.

--- configure.in.orig	2021-01-16 05:20:02 UTC
+++ configure.in
@@ -104,7 +104,7 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
 AC_SUBST(CFLAGS)
 
 AC_PROG_INSTALL
-AC_PATH_PROG(SH,bash sh)
+AC_PATH_PROG(SH,sh)
 AC_PATH_PROG(RM,rm)
 AC_PATH_PROG(CP,cp)
 AC_PATH_PROG(MT,mt,AC_MSG_WARN(could not find the program mt - you might need this if you want autoloader support))
@@ -113,7 +113,7 @@ AC_PATH_PROG(AWK,awk)
 AC_SYS_LARGEFILE
 AC_STRUCT_ST_BLKSIZE
 
-AC_CHECK_TARGET_TOOLS(OBJDUMP,gobjdump objdump)
+AC_CHECK_TARGET_TOOLS(OBJDUMP,gobjdump objdump llvm-objdump)
 
 AC_HEADER_ASSERT
 AC_CHECK_LIB(pthread, pthread_mutex_init)