diff --git a/gsm.spec b/gsm.spec
index f8489eeef31334f91cb35555339233ee0b19a947..c60858b24ea5d96ec49c621c3023a051479d7135 100644
--- a/gsm.spec
+++ b/gsm.spec
@@ -1,6 +1,6 @@
 Name:           gsm
 Version:        1.0.18
-Release:        5
+Release:        6
 Summary:        GSM speech compressor Shared libraries and Utilities
 License:        MIT
 URL:            http://www.quut.com/gsm/
@@ -9,6 +9,7 @@ Source0:        http://www.quut.com/gsm/%{name}-%{version}.tar.gz
 # below patches are from redhat.
 Patch0:         gsm-makefile.patch
 Patch1:         gsm-warnings.patch
+Patch2:         support-specify-cc.patch
 
 Provides:       gsm-tool
 Obsoletes:      gsm-tool
@@ -74,6 +75,9 @@ make addtst
 %{_mandir}/man*/*
 
 %changelog
+* Fri Apr 14 2023 jammyjellyfish <jammyjellyfish255@outlook.com> - 1.0.18-6
+- Support specify CC
+
 * Fri Jun 4 2021 wangkerong <wangkerong@huawei.com> 1.0.18-5
 - Add a BuildRequires for gcc 
 
diff --git a/support-specify-cc.patch b/support-specify-cc.patch
new file mode 100644
index 0000000000000000000000000000000000000000..8ba536d6d33d977e214acd41f937b82486868e95
--- /dev/null
+++ b/support-specify-cc.patch
@@ -0,0 +1,13 @@
+diff -up gsm-1.0-pl18/Makefile.orig gsm-1.0-pl18/Makefile
+--- gsm-1.0-pl18/Makefile.orig	2023-04-14 22:20:16.910186912 +0800
++++ gsm-1.0-pl18/Makefile	2023-04-14 22:25:09.582803780 +0800
+@@ -43,7 +43,8 @@ WAV49	= -DWAV49
+ # CC		= /usr/lang/acc
+ # CCFLAGS 	= -c -O
+ 
+-CC		= gcc -ansi -pedantic
++CC		?= gcc
++CC		:= $(CC) -ansi -pedantic
+ CCFLAGS 	= -c $(RPM_OPT_FLAGS) -DNeedFunctionPrototypes=1 -Wall -Wno-comment -D_XOPEN_SOURCE=700 -D_REENTRANT -fPIC
+ 
+ LD 		= $(CC)