PHP 7.3.0 Install on Solaris 10 Issues

Good afternoon, I am getting an error when I run the "make" on my Solaris 10 Sparc computer.. pcre2_jit_compile.c:8211: error: duplicate case value. Prior to this I had to add "-std=gnu99" to my CFLAGS to get around C99 environment error. I currently have PHP 5.6.40 installed with Apache 2.4.34. This "configure, make, make test" worked just fine. Right now the "make" for 7.3.0 fails. Please assist. Thanks Shirley S. Thompson Global Integrated Broadcast Service Support Center (GIBSSC) (Contractor - DWS Consulting, Inc.) 301 688-3083 (u) 996-2411 (s) This message and any attachments are solely for the use of the individual or entity to whom it is addressed, and may contain information that is privileged or protected. If you are not the intended recipient, any disclosure, use or distribution of the information contained herein is prohibited. If you have received this communication in error, please notify the sender by reply e-mail and immediately delete this message and any attachments. In the event this document(s) contains technical data within the definition of the International Traffic in Arms Regulations or Export Administration Regulations, it is subject to the export control laws of the U.S. Government and transfer of this data to a foreign person, whether in the United States or abroad, without an export license or other approval from the U.S. Department ofState or U.S. Department of Commerce, is prohibited. UNCLASSIFIED//FOR OFFICIAL USE ONLY