diff --git a/c_check b/c_check
index 3d82aa73c..fbd1838aa 100644
--- a/c_check
+++ b/c_check
@@ -188,13 +188,13 @@ if (($architecture eq "mips") || ($architecture eq "mips64")) {
     if ($@){ 
 	warn "could not load PERL module File::Temp, so could not check MSA capatibility";
     } else {
-	$tmpf = new File::Temp( UNLINK => 1 );
+	$tmpf = new File::Temp( SUFFIX => '.c' , UNLINK => 1 );
 	$code = '"addvi.b $w0, $w1, 1"';
 	$msa_flags = "-mmsa -mfp64 -msched-weight -mload-store-pairs";
 	print $tmpf "#include <msa.h>\n\n";
 	print $tmpf "void main(void){ __asm__ volatile($code); }\n";
 
-	$args = "$msa_flags -o $tmpf.o -x c $tmpf";
+	$args = "$msa_flags -o $tmpf.o $tmpf";
 	my @cmd = ("$compiler_name $args");
 	system(@cmd) == 0;
 	if ($? != 0) {
@@ -229,10 +229,13 @@ if (($architecture eq "x86") || ($architecture eq "x86_64")) {
 	$no_avx512 = 0;
     } else {
 #	$tmpf = new File::Temp( UNLINK => 1 );
-	($fh,$tmpf) = tempfile( UNLINK => 1 );
+	($fh,$tmpf) = tempfile( SUFFIX => '.c' , UNLINK => 1 );
 	$code = '"vbroadcastss -4 * 4(%rsi), %zmm2"';
 	print $tmpf "#include <immintrin.h>\n\nint main(void){ __asm__ volatile($code); }\n";
-	$args = " -march=skylake-avx512 -c -o $tmpf.o -x c $tmpf";
+	$args = " -march=skylake-avx512 -c -o $tmpf.o $tmpf";
+	if ($compiler eq "PGI") {
+	    $args = " -tp skylake -c -o $tmpf.o $tmpf";
+	}
 	my @cmd = ("$compiler_name $args >/dev/null 2>/dev/null");
 	system(@cmd) == 0;
 	if ($? != 0) {
@@ -318,6 +321,7 @@ $linker_a = "";
 	    && ($flags !~ /kernel32/)
 	    && ($flags !~ /advapi32/)
 	    && ($flags !~ /shell32/)
+	    && ($flags !~ /omp/)
 	    ) {
 	    $linker_l .= $flags . " "
 	}
diff --git a/f_check b/f_check
index 79b24e2dc..fac8fc707 100644
--- a/f_check
+++ b/f_check
@@ -334,6 +334,7 @@ if ($link ne "") {
 	    && ($flags !~ /kernel32/)
 	    && ($flags !~ /advapi32/)
 	    && ($flags !~ /shell32/)
+	    && ($flags !~ /omp/)
 		&& ($flags !~ /^\-l$/)
 	    ) {
 	    $linker_l .= $flags . " ";
diff --git a/utest/Makefile b/utest/Makefile
index 8c7e6b9f8..bd4bdf3ae 100644
--- a/utest/Makefile
+++ b/utest/Makefile
@@ -31,6 +31,10 @@ OBJS += test_fork.o
 endif
 endif
 
+ifeq ($(C_COMPILER), PGI)
+OBJS = utest_main2.o
+endif
+
 all : run_test
 
 $(UTESTBIN): $(OBJS)