CentOS build issues.

README.md

@@ -125,7 +125,16 @@ On Debian / Ubuntu / Raspbian:
 
 Or on Red Hat / Fedora / Centos:
 
-    sudo yum install cmake
+CentOS 6 & 7 currently have cmake 2.8 but we need 3.1 or later.
+First you need to enable the EPEL repository.  Add a symlink if you want to type cmake rather than cmake3.
+
+	sudo yum install epel-release
+	sudo rpm -e cmake
+	sudo yum install cmake3
+	sudo ln -s /usr/bin/cmake3 /usr/bin/cmake
+
+Continue with the other required packages:
+
     sudo yum install alsa-lib-devel
     sudo yum install libudev-devel
 

src/ptt.c

@@ -62,8 +62,8 @@
  *---------------------------------------------------------------*/
 
 /*
-	A growing number of people have been asking about support for the DMK URI
-	or the similar RB-USB RIM.
+	A growing number of people have been asking about support for the DMK URI,
+	RB-USB RIM, etc.
 
 	These use a C-Media CM108/CM119 with an interesting addition, a GPIO
 	pin is used to drive PTT.  Here is some related information.
@@ -78,6 +78,15 @@
 		http://www.repeater-builder.com/products/usb-rim-lite.html
 		http://www.repeater-builder.com/voip/pdf/cm119-datasheet.pdf
 
+	RA-35:
+
+		http://www.masterscommunications.com/products/radio-adapter/ra35.html
+
+	DINAH:
+
+		https://hamprojects.info/dinah/
+
+
 	Homebrew versions of the same idea:
 
 		http://images.ohnosec.org/usbfob.pdf
@@ -147,6 +156,11 @@
 #include <unistd.h>
 #include <errno.h>
 #include <grp.h>
+
+#ifndef __USE_BSD
+#define __USE_BSD	// Needed for gcc 4.8.5 to find definitions for scandir
+			// and alphasort.  Newer compilers don't have this issue.
+#endif
 #include <dirent.h>
 
 #ifdef USE_HAMLIB