--- a/aconfigure.ac	2020-02-14 09:48:27.000000000 -0000
+++ b/aconfigure.ac	2021-10-11 19:57:55.416969979 -0000
@@ -1927,33 +1927,35 @@
 			     [Exclude OPUS support from the build (default: autodetect)])
 	      ,
 	      [
-		if test "$enable_opus" = "no"; then
-		 [ac_no_opus=1]
-		 AC_DEFINE(PJMEDIA_HAS_OPUS_CODEC,0)
-		 AC_MSG_RESULT([Checking if OPUS support is disabled... yes])
-	        fi
+			if test "$enable_opus" = "no"; then
+				[ac_no_opus=1]
+				AC_DEFINE(PJMEDIA_HAS_OPUS_CODEC,0)
+				AC_MSG_RESULT([Checking if OPUS support is disabled... yes])
+			fi
 	      ],
 	      [
-		AC_MSG_RESULT([checking for OPUS installations..])
-                if test "x$with_opus" != "xno" -a "x$with_opus" != "x"; then
-                    CFLAGS="$CFLAGS -I$with_opus/include"
-                    CPPFLAGS="$CPPFLAGS -I$with_opus/include"
-                    LDFLAGS="$LDFLAGS -L$with_opus/lib"
-                    AC_MSG_RESULT([Using OPUS prefix... $with_opus])
-                fi
-		AC_SUBST(opus_h_present)
-		AC_SUBST(opus_present)
-		AC_CHECK_HEADER(opus/opus.h,[opus_h_present=1])
-		AC_CHECK_LIB(opus,opus_repacketizer_get_size,[opus_present=1 && LIBS="-lopus $LIBS"])
-		if test "x$opus_h_present" = "x1" -a "x$opus_present" = "x1"; then
-	        	AC_MSG_RESULT([OPUS library found, OPUS support enabled])
-	        	AC_DEFINE(PJMEDIA_HAS_OPUS_CODEC,1)
-		else
-			[ac_no_opus=1]
-	        	AC_MSG_RESULT([OPUS library not found, OPUS support disabled])
-			AC_DEFINE(PJMEDIA_HAS_OPUS_CODEC,0)
-		fi
 	      ])
+if test "x$ac_no_opus" = "x"; then
+	AC_MSG_RESULT([checking for OPUS installations..])
+			if test "x$with_opus" != "xno" -a "x$with_opus" != "x"; then
+				CFLAGS="$CFLAGS -I$with_opus/include"
+				CPPFLAGS="$CPPFLAGS -I$with_opus/include"
+				LDFLAGS="$LDFLAGS -L$with_opus/lib"
+				AC_MSG_RESULT([Using OPUS prefix... $with_opus])
+			fi
+	AC_SUBST(opus_h_present)
+	AC_SUBST(opus_present)
+	AC_CHECK_HEADER(opus/opus.h,[opus_h_present=1])
+	AC_CHECK_LIB(opus,opus_repacketizer_get_size,[opus_present=1 && LIBS="-lopus $LIBS"])
+	if test "x$opus_h_present" = "x1" -a "x$opus_present" = "x1"; then
+			AC_MSG_RESULT([OPUS library found, OPUS support enabled])
+			AC_DEFINE(PJMEDIA_HAS_OPUS_CODEC,1)
+	else
+		[ac_no_opus=1]
+			AC_MSG_RESULT([OPUS library not found, OPUS support disabled])
+		AC_DEFINE(PJMEDIA_HAS_OPUS_CODEC,0)
+	fi
+fi
 
 dnl # bcg729 prefix
 AC_ARG_WITH(bcg729,