--- configure.in.orig	2018-03-18 14:15:27 UTC
+++ configure.in
@@ -633,7 +633,7 @@ AC_DEFUN([RUBY_DTRACE_AVAILABLE],
 [AC_CACHE_CHECK(whether dtrace USDT is available, rb_cv_dtrace_available,
 [
     echo "provider conftest{ probe fire(); };" > conftest_provider.d
-    if $DTRACE -h -o conftest_provider.h -s conftest_provider.d >/dev/null 2>/dev/null; then
+    if $DTRACE -xnolibs -h -o conftest_provider.h -s conftest_provider.d >/dev/null 2>/dev/null; then
       AC_TRY_COMPILE([@%:@include "conftest_provider.h"], [CONFTEST_FIRE();], [
 	# DTrace is available on the system
 	rb_cv_dtrace_available=yes
@@ -657,13 +657,13 @@ AC_DEFUN([RUBY_DTRACE_POSTPROCESS],
       probe fire();
     };
 _PROBES
-    $DTRACE -h -o conftest_provider.h -s conftest_provider.d >/dev/null 2>/dev/null &&
+    $DTRACE -xnolibs -h -o conftest_provider.h -s conftest_provider.d >/dev/null 2>/dev/null &&
     :
   }; then
     AC_TRY_COMPILE([@%:@include "conftest_provider.h"], [CONFTEST_FIRE();], [
 	if {
 	    cp -p conftest.${ac_objext} conftest.${ac_objext}.save &&
-	    $DTRACE -G -s conftest_provider.d conftest.${ac_objext} 2>/dev/null &&
+	    $DTRACE -xnolibs -G -s conftest_provider.d conftest.${ac_objext} 2>/dev/null &&
 	    :
 	}; then
 	    if cmp -s conftest.o conftest.${ac_objext}.save; then
@@ -1290,10 +1290,10 @@ main()
   ],
 [	LIBS="-lm $LIBS"])
 
-AC_CHECK_LIB(crypt, crypt)      # glibc (GNU/Linux, GNU/Hurd, GNU/kFreeBSD)
-AC_CHECK_LIB(dl, dlopen)	# Dynamic linking for SunOS/Solaris and SYSV
-AC_CHECK_LIB(dld, shl_load)	# Dynamic linking for HP-UX
-AC_CHECK_LIB(socket, shutdown)  # SunOS/Solaris
+AC_SEARCH_LIBS(crypt, crypt)      # glibc (GNU/Linux, GNU/Hurd, GNU/kFreeBSD)
+AC_SEARCH_LIBS(dlopen, dl)	# Dynamic linking for SunOS/Solaris and SYSV
+AC_SEARCH_LIBS(shl_load, dld)	# Dynamic linking for HP-UX
+AC_SEARCH_LIBS(shutdown, socket)  # SunOS/Solaris
 
 dnl Checks for header files.
 AC_HEADER_DIRENT
@@ -2450,7 +2450,7 @@ if test "$ac_cv_func_qsort_r" != no; the
   AC_CACHE_CHECK(whether qsort_r is GNU version, rb_cv_gnu_qsort_r,
     [AC_TRY_COMPILE([
 @%:@include <stdlib.h>
-void qsort_r(void *base, size_t nmemb, size_t size,
+void (qsort_r)(void *base, size_t nmemb, size_t size,
 	    int (*compar)(const void *, const void *, void *),
 	    void *arg);
 ],[ ],
@@ -2460,7 +2460,7 @@ void qsort_r(void *base, size_t nmemb, s
   AC_CACHE_CHECK(whether qsort_r is BSD version, rb_cv_bsd_qsort_r,
     [AC_TRY_COMPILE([
 @%:@include <stdlib.h>
-void qsort_r(void *base, size_t nmemb, size_t size,
+void (qsort_r)(void *base, size_t nmemb, size_t size,
 	     void *arg, int (*compar)(void *, const void *, const void *));
 ],[ ],
       [rb_cv_bsd_qsort_r=yes],
@@ -2549,7 +2549,7 @@ main(int argc, char **argv)
 if test x"$ac_cv_func_clock_gettime" != xyes; then
     # glibc 2.17 moves clock_* functions from librt to the main C library.
     # http://sourceware.org/ml/libc-announce/2012/msg00001.html
-    AC_CHECK_LIB(rt, clock_gettime)
+    AC_SEARCH_LIBS(clock_gettime, rt)
     if test x"$ac_cv_lib_rt_clock_gettime" = xyes; then
 	AC_DEFINE(HAVE_CLOCK_GETTIME, 1)
     fi
@@ -2956,7 +2956,7 @@ else
 fi
 
 if test x"$enable_pthread" = xyes; then
-    for pthread_lib in thr pthread pthreads c c_r root; do
+    for pthread_lib in pthread thr pthreads c c_r root; do
 	AC_CHECK_LIB($pthread_lib, pthread_kill,
 		     rb_with_pthread=yes, rb_with_pthread=no)
 	if test "$rb_with_pthread" = "yes"; then break; fi
@@ -2970,6 +2970,7 @@ if test x"$enable_pthread" = xyes; then
 	[c],    [],
 	[root], [],
 	[c_r],  [MAINLIBS="-pthread $MAINLIBS"],
+	[pthread],  [MAINLIBS="-pthread $MAINLIBS"],
 	        [AS_CASE(["$target_os"],
 		    [openbsd*|mirbsd*], [LIBS="-pthread $LIBS"],
 		    [LIBS="-l$pthread_lib $LIBS"])])
@@ -3278,7 +3279,6 @@ if test "$with_dln_a_out" != yes; then
 			: ${LDSHARED='$(CC) -shared'}
 			if test "$rb_cv_binary_elf" = yes; then
 			    LDFLAGS="$LDFLAGS -rdynamic"
-			    DLDFLAGS="$DLDFLAGS "'-Wl,-soname,$@'
 			else
 			  test "$GCC" = yes && test "$rb_cv_prog_gnu_ld" = yes || LDSHARED='$(LD) -Bshareable'
 			fi
@@ -3751,6 +3751,7 @@ AS_CASE("$enable_shared", [yes], [
     [freebsd*|dragonfly*], [
 	SOLIBS='$(LIBS)'
 	LIBRUBY_SO='lib$(RUBY_SO_NAME).so.$(MAJOR)$(MINOR)'
+	LIBRUBY_DLDFLAGS='-Wl,-soname,$(LIBRUBY_SO)'
 	if test "$rb_cv_binary_elf" != "yes" ; then
 	    LIBRUBY_SO="$LIBRUBY_SO.\$(TEENY)"
 	    LIBRUBY_ALIASES=''