diff --git a/compat/getentropy_linux.c b/compat/getentropy_linux.c
index 8bfafe444..098b375b8 100644
--- a/compat/getentropy_linux.c
+++ b/compat/getentropy_linux.c
@@ -68,12 +68,10 @@
 
 #define HR(x, l) (SHA512_Update(&ctx, (char *)(x), (l)))
 #define HD(x)	 (SHA512_Update(&ctx, (char *)&(x), sizeof (x)))
-/* (portability) some compilers cannot take sizeof a function pointer */
 #define HF(x)    (SHA512_Update(&ctx, (char *)&(x), sizeof (void*)))
 
 int	getentropy(void *buf, size_t len);
 
-/* referencing functions in other link modules is not portable */
 extern int main(int, char *argv[]);
 static int gotdata(char *buf, size_t len);
 static int getentropy_urandom(void *buf, size_t len);
diff --git a/compat/getentropy_osx.c b/compat/getentropy_osx.c
index 8cf46e5ef..b0f78bdff 100644
--- a/compat/getentropy_osx.c
+++ b/compat/getentropy_osx.c
@@ -70,12 +70,10 @@
 
 #define HR(x, l) (SHA512_Update(&ctx, (char *)(x), (l)))
 #define HD(x)	 (SHA512_Update(&ctx, (char *)&(x), sizeof (x)))
-/* (portability) some compilers cannot take sizeof a function pointer */
 #define HF(x)    (SHA512_Update(&ctx, (char *)&(x), sizeof (void*)))
 
 int	getentropy(void *buf, size_t len);
 
-/* referencing functions in other link modules is not portable */
 extern int main(int, char *argv[]);
 static int gotdata(char *buf, size_t len);
 static int getentropy_urandom(void *buf, size_t len);
diff --git a/compat/getentropy_solaris.c b/compat/getentropy_solaris.c
index f2857a851..e46501935 100644
--- a/compat/getentropy_solaris.c
+++ b/compat/getentropy_solaris.c
@@ -61,12 +61,11 @@
 
 #define HR(x, l) (SHA512_Update(&ctx, (char *)(x), (l)))
 #define HD(x)	 (SHA512_Update(&ctx, (char *)&(x), sizeof (x)))
-/* (portability) some compilers cannot take sizeof a function pointer */
 #define HF(x)	 (SHA512_Update(&ctx, (char *)&(x), sizeof (void*)))
 
 int	getentropy(void *buf, size_t len);
 
-/* referencing functions in other link modules is not portable */
+/* referencing functions in other link modules is not portable with sun-cc */
 /* extern int main(int, char *argv[]); */
 static int gotdata(char *buf, size_t len);
 static int getentropy_urandom(void *buf, size_t len, const char *path,