fix: trying to fix compilation on Linux

CMakeLists.txt

@@ -39,6 +39,7 @@ endif()
 # Check for headers and symbols
 check_include_file("getopt.h" HAVE_GETOPT_H)
 check_include_file("libintl.h" HAVE_LIBINTL_H)
+check_include_file("unistd.h" HAVE_UNISTD_H)
 check_symbol_exists(isatty unistd.h HAVE_ISATTY)
 
 # Turn on all compiler warnings
@@ -67,7 +68,7 @@ target_include_directories(stitch PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/src ${CURL
 target_link_libraries(stitch ${MATH_LIBRARY} CURL::libcurl)
 
 if(WIN32)
-	add_compile_definitions(_USE_MATH_DEFINES)
+	add_compile_definitions(_USE_MATH_DEFINES _CRT_SECURE_NO_WARNINGS)
 endif()
 
 if(JPEG_FOUND)

src/stitch.c

@@ -1,6 +1,7 @@
 #include "config.h"
 
 #include <stdbool.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -11,6 +12,10 @@
 #include "formats/jpeg.h"
 #include "formats/png.h"
 
+#if HAVE_UNISTD_H
+#   include <unistd.h>
+#endif
+
 #if HAVE_GETOPT_H
 #   include <getopt.h>
 #else