Index: src/base/main/mainReal.c
--- src/base/main/mainReal.c.orig
+++ src/base/main/mainReal.c
@@ -139,7 +139,16 @@ int Abc_RealMain( int argc, char * argv[] )
                     maxMb * (1llu << 20), /* soft limit */      
                     maxMb * (1llu << 20)  /* hard limit */      
                 };                                              
+#ifndef __OpenBSD__
                 setrlimit(RLIMIT_AS, &limit);                   
+#else
+                /*
+                 * OpenBSD doesn't support RLIMIT_AS:
+                 * choosing RLIMIT_DATA as the closest match
+                 * (see e.g.: https://github.com/OSGeo/gdal/issues/1163)
+                 */
+                setrlimit(RLIMIT_DATA, &limit);
+#endif
 #endif
                 break; 
             }