fix prepoc dir for compilation on mac silicon - autogen, cmake, build.command (#1688)

Co-authored-by: vats004 <=>

Author: vatsalkeshav

docs/COMPILATION.MD

@@ -133,6 +133,7 @@ Dependencies can be installed via Homebrew as:
 ```bash
 brew install pkg-config
 brew install autoconf automake libtool
+brew install cmake gpac
 # optional if you want OCR:
 brew install tesseract
 brew install leptonica

src/thirdparty/libpng/pngpriv.h

@@ -506,35 +506,41 @@
 #  define png_aligncastconst(type, value) ((const void*)(value))
 #endif /* __cplusplus */
 
-#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
-    defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
+#if defined(PNG_FLOATING_POINT_SUPPORTED) || defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
    /* png.c requires the following ANSI-C constants if the conversion of
     * floating point to ASCII is implemented therein:
     *
     *  DBL_DIG  Maximum number of decimal digits (can be set to any constant)
     *  DBL_MIN  Smallest normalized fp number (can be set to an arbitrary value)
     *  DBL_MAX  Maximum floating point number (can be set to an arbitrary value)
     */
+
 #  include <float.h>
 
-#  if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
-    defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
+   /* Handle floating-point headers depending on the platform */
+#  if ((defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
+       defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)) && \
+      !(defined(__APPLE__) && defined(__MACH__)) // this if block gets executed for older macOS versions
    /* We need to check that <math.h> hasn't already been included earlier
     * as it seems it doesn't agree with <fp.h>, yet we should really use
     * <fp.h> if possible.
     */
 #    if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
 #      include <fp.h>
 #    endif
-#  else
+#  else // this if block gets executed for newer macOS versions(Ventura/Sonoma/Sequoia) OR other platforms
+    /* if (defined(__APPLE__) && defined(__MACH__)) or other cases */
+    /* Include math.h for macOS and all other platforms */
 #    include <math.h>
 #  endif
+
 #  if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
    /* Amiga SAS/C: We must include builtin FPU functions when compiling using
     * MATH=68881
     */
 #    include <m68881.h>
 #  endif
+
 #endif
 
 /* This provides the non-ANSI (far) memory allocation routines. */

src/thirdparty/zlib/zutil.h

@@ -130,7 +130,7 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 #  endif
 #endif
 
-#if defined(MACOS) || defined(TARGET_OS_MAC)
+#if defined(MACOS) // for older macOS 
 #  define OS_CODE  7
 #  ifndef Z_SOLO
 #    if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
@@ -141,6 +141,8 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 #      endif
 #    endif
 #  endif
+#elif defined(__MACH__) && defined(__APPLE__) && defined(TARGET_OS_MAC) // for newer macOS(Ventura/Sonoma/Sequoia)
+// do nothing because fdopen is defined already by XCode command-line-tools in these macOS versions
 #endif
 
 #ifdef __acorn