Commits on Aug 8, 2024

1. Fix compilation error on gcc 4.2 …

   R
   > devtools::install()
   
   Compilation error encountered with gcc 4.2:
   
   ```
   In file included from gdal.cpp:1:
   ./gdal.h:3:1: error: ‘OGRSpatialReference’ does not name a type; did you mean ‘DEFINED_OGRSpatialReferenc
   eH’?
       3 | OGRSpatialReference *handle_axis_order(OGRSpatialReference *sr);
         | ^~~~~~~~~~~~~~~~~~~
         | DEFINED_OGRSpatialReferenceH
   ./gdal.h:4:1: error: ‘Rcpp’ does not name a type
       4 | Rcpp::List create_crs(const OGRSpatialReference *ref, bool set_input);
         | ^~~~
   ```
   
   This commit forward declares `OGRSpatialReference` to fix the first
   error above, and it includes `Rcpp.h` explicitly to fix the second
   error.
   
   ```
   $ R --version
   R version 4.4.1 (2024-06-14) -- "Race for Your Life"
   
   $ gcc --version
   gcc (GCC) 14.2.1 20240802
   
   $ uname -a
   Linux durus 6.10.3-arch1-1 r-spatial#1 SMP PREEMPT_DYNAMIC Sun, 04 Aug 2024 05:11:32 +0000 x86_64 GNU/Linux
   ```

   

   djhshih committed Aug 8, 2024
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