diff --git a/desc.c b/desc.c
index 379950b..2b0cd53 100644
--- a/desc.c
+++ b/desc.c
@@ -834,7 +834,7 @@
 				tprintf("{%p, %p, %ld, %ld}",
 					event.data, event.obj,
 					event.res, event.res2);
-			else 
+			else
 #endif
 				tprintf("{...}");
 		}
diff --git a/strace.c b/strace.c
index 5f50760..4783453 100644
--- a/strace.c
+++ b/strace.c
@@ -2408,7 +2408,9 @@
 					return -1;
 				}
 			}
-#ifdef LINUX /* add more OSes after you verified it works for them */
+/* PTRACE_SETOPTIONS is not a #define. PT_SETOPTIONS is. */
+/* Add more OSes after you verified it works for them. */
+#if defined LINUX && defined PT_SETOPTIONS
 			/*
 			 * Ask kernel to set signo to SIGTRAP | 0x80
 			 * on ptrace-generated SIGTRAPs, and mark
@@ -2423,7 +2425,7 @@
 			goto tracing;
 		}
 
-#ifdef LINUX
+#if defined LINUX && defined PT_SETOPTIONS
 		if (tcp->sigtrap80 != SIGTRAP && WSTOPSIG(status) == SIGTRAP) {
 			/*
 			 * We told ptrace to report SIGTRAP | 0x80 on this process
diff --git a/svr4/syscallent.h b/svr4/syscallent.h
index 239d6b0..d8e5a12 100644
--- a/svr4/syscallent.h
+++ b/svr4/syscallent.h
@@ -823,5 +823,5 @@
 	{ -1,	TF,	sys_aioaread64,		"aioaread64"	}, /* 417 */
 	{ -1,	TF,	sys_aioawrite64,	"aioawrite64"	}, /* 418 */
 	{ -1,	TF,	sys_aiocancel64,	"aiocancel64"	}, /* 419 */
-	{ -1,	TF,	sys_aiofsync,		"aiofsync"	}, /* 420 */ 
+	{ -1,	TF,	sys_aiofsync,		"aiofsync"	}, /* 420 */
 #endif
diff --git a/test/childthread.c b/test/childthread.c
index bc10d3a..bd0174b 100644
--- a/test/childthread.c
+++ b/test/childthread.c
@@ -1,7 +1,7 @@
 /* Test exit of a child of a TCB_EXITING child where the toplevel process starts
  * waiting on it.  The middle one gets detached and strace must update the
  * toplevel process'es number of attached children to 0.
- * 
+ *
  * gcc -o test/childthread test/childthread.c -Wall -ggdb2 -pthread;./strace -f ./test/childthread
  * It must print: write(1, "OK\n", ...
  */
diff --git a/test/leaderkill.c b/test/leaderkill.c
index a5b27a5..18d6e12 100644
--- a/test/leaderkill.c
+++ b/test/leaderkill.c
@@ -1,7 +1,7 @@
 /* Test handle_group_exit () handling of a thread leader still alive with its
  * thread child calling exit_group () and proper passing of the process exit
  * code to the process parent of this whole thread group.
- * 
+ *
  * gcc -o test/leaderkill test/leaderkill.c -Wall -ggdb2 -pthread;./test/leaderkill & pid=$!;sleep 1;strace -o x -q ./strace -f -p $pid
  * It must print: write(1, "OK\n", ...
  */