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-rw-r--r--ConfigureChecks.cmake1
1 files changed, 1 insertions, 0 deletions
diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index d56f15b3..5364739a 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -49,6 +49,7 @@ endif(CMAKE_COMPILER_IS_GNUCC AND NOT MINGW AND NOT OS2)
check_include_file(argp.h HAVE_ARGP_H)
check_include_file(pty.h HAVE_PTY_H)
check_include_file(termios.h HAVE_TERMIOS_H)
+check_include_file(unistd.h HAVE_UNISTD_H)
if (WIN32)
check_include_files("winsock2.h;ws2tcpip.h;wspiapi.h" HAVE_WSPIAPI_H)