diff --git a/Externals/bzip2/CMakeLists.txt b/Externals/bzip2/CMakeLists.txt
index 5ab09692df..62e0e075c4 100644
--- a/Externals/bzip2/CMakeLists.txt
+++ b/Externals/bzip2/CMakeLists.txt
@@ -3,7 +3,6 @@ project(bzip2 C)
 include(CheckTypeSize)
 include(CheckFunctionExists)
 include(CheckIncludeFile)
-include(CheckCSourceCompiles)
 
 check_include_file(sys/types.h HAVE_SYS_TYPES_H)
 check_include_file(stdint.h    HAVE_STDINT_H)
diff --git a/Externals/liblzma/CMakeLists.txt b/Externals/liblzma/CMakeLists.txt
index 3c728a007e..0d33d0ad9d 100644
--- a/Externals/liblzma/CMakeLists.txt
+++ b/Externals/liblzma/CMakeLists.txt
@@ -3,7 +3,6 @@ project(lzma C)
 include(CheckTypeSize)
 include(CheckFunctionExists)
 include(CheckIncludeFile)
-include(CheckCSourceCompiles)
 
 check_include_file(sys/types.h HAVE_SYS_TYPES_H)
 check_include_file(stdint.h    HAVE_STDINT_H)
diff --git a/Externals/zstd/CMakeLists.txt b/Externals/zstd/CMakeLists.txt
index 335ad06abf..bb164b45a7 100644
--- a/Externals/zstd/CMakeLists.txt
+++ b/Externals/zstd/CMakeLists.txt
@@ -7,7 +7,6 @@ endif()
 include(CheckTypeSize)
 include(CheckFunctionExists)
 include(CheckIncludeFile)
-include(CheckCSourceCompiles)
 
 check_include_file(sys/types.h HAVE_SYS_TYPES_H)
 check_include_file(stdint.h    HAVE_STDINT_H)