diff --git a/src/api/arpa_inet.c b/src/api/arpa_inet.c
index afbfca1..b6b6356 100644
--- a/src/api/arpa_inet.c
+++ b/src/api/arpa_inet.c
@@ -1,6 +1,7 @@
 #include <arpa/inet.h>
 #define T(t) (t*)0;
 #define C(n) switch(n){case n:;}
+#define I(t,e) {t x[sizeof(t)==sizeof(e)] = {e};}
 static void f()
 {
 T(in_port_t)
@@ -13,22 +14,22 @@ C(INET_ADDRSTRLEN)
 C(INET6_ADDRSTRLEN)
 
 #ifdef htonl
-C(htonl(0))
+I(uint32_t, htonl(0LL))
 #else
 {uint32_t(*p)(uint32_t) = htonl;}
 #endif
 #ifdef htons
-C(htons(0))
+I(uint32_t, htons(0LL))
 #else
 {uint16_t(*p)(uint16_t) = htons;}
 #endif
 #ifdef ntohl
-C(ntohl(0))
+I(uint32_t, ntohl(0LL))
 #else
 {uint32_t(*p)(uint32_t) = ntohl;}
 #endif
 #ifdef ntohs
-C(ntohs(0))
+I(uint16_t, ntohs(0LL))
 #else
 {uint16_t(*p)(uint16_t) = ntohs;}
 #endif
diff --git a/src/api/float.c b/src/api/float.c
index 5a29ecc..2a4a7c7 100644
--- a/src/api/float.c
+++ b/src/api/float.c
@@ -1,10 +1,10 @@
 #include <float.h>
-#define I(n) {int i = n;}
+#define I(t,e) {t x[sizeof(t)==sizeof(e)] = {e};}
 #define C(n) switch(n){case n:;}
 #define D(n) {long double d = n;}
 static void f()
 {
-I(FLT_ROUNDS)
+I(int,FLT_ROUNDS)
 C(FLT_EVAL_METHOD)
 C(FLT_RADIX)
 C(FLT_MANT_DIG)
diff --git a/src/api/math.c b/src/api/math.c
index 2949140..5d6d3f0 100644
--- a/src/api/math.c
+++ b/src/api/math.c
@@ -1,26 +1,26 @@
 #include <math.h>
 #define T(t) (t*)0;
 #define C(n) switch(n){case n:;}
-#define I(n) {int i = n;}
+#define I(t,e) {t x[sizeof(t)==sizeof(e)] = {e};}
 #define D(n) {double d = n;}
 static void f()
 {
 T(float_t)
 T(double_t)
-I(fpclassify(.0))
-I(isfinite(.0))
-I(isgreater(.0,.0))
-I(isgreaterequal(.0,.0))
-I(isinf(.0))
-I(isless(.0,.0))
-I(islessequal(.0,.0))
-I(islessgreater(.0,.0))
-I(isnan(.0))
-I(isnormal(.0))
-I(isunordered(.0,.0))
-I(signbit(.0))
+I(int,fpclassify(.0))
+I(int,isfinite(.0))
+I(int,isgreater(.0,.0))
+I(int,isgreaterequal(.0,.0))
+I(int,isinf(.0))
+I(int,isless(.0,.0))
+I(int,islessequal(.0,.0))
+I(int,islessgreater(.0,.0))
+I(int,isnan(.0))
+I(int,isnormal(.0))
+I(int,isunordered(.0,.0))
+I(int,signbit(.0))
 #ifdef _XOPEN_SOURCE
-I(signgam)
+I(int,signgam)
 D(M_E)
 D(M_LOG2E)
 D(M_LOG10E)
diff --git a/src/api/netinet_in.c b/src/api/netinet_in.c
index 648c794..1e95406 100644
--- a/src/api/netinet_in.c
+++ b/src/api/netinet_in.c
@@ -2,7 +2,7 @@
 #define T(t) (t*)0;
 #define F(t,n) {t *y = &x.n;}
 #define C(n) switch(n){case n:;}
-#define I(n) {int i = n;}
+#define I(t,e) {t x[sizeof(t)==sizeof(e)] = {e};}
 static void f()
 {
 T(in_port_t)
@@ -50,10 +50,10 @@ C(IPPROTO_UDP)
 C(INADDR_ANY)
 C(INADDR_BROADCAST)
 C(INET_ADDRSTRLEN)
-I(htonl(0))
-I(htons(0))
-I(ntohl(0))
-I(ntohs(0))
+I(uint32_t,htonl(0LL))
+I(uint16_t,htons(0LL))
+I(uint32_t,ntohl(0LL))
+I(uint16_t,ntohs(0LL))
 C(INET6_ADDRSTRLEN)
 C(IPV6_JOIN_GROUP)
 C(IPV6_LEAVE_GROUP)
@@ -62,16 +62,16 @@ C(IPV6_MULTICAST_IF)
 C(IPV6_MULTICAST_LOOP)
 C(IPV6_UNICAST_HOPS)
 C(IPV6_V6ONLY)
-I(IN6_IS_ADDR_UNSPECIFIED(&in6addr_any))
-I(IN6_IS_ADDR_LOOPBACK(&in6addr_any))
-I(IN6_IS_ADDR_MULTICAST(&in6addr_any))
-I(IN6_IS_ADDR_LINKLOCAL(&in6addr_any))
-I(IN6_IS_ADDR_SITELOCAL(&in6addr_any))
-I(IN6_IS_ADDR_V4MAPPED(&in6addr_any))
-I(IN6_IS_ADDR_V4COMPAT(&in6addr_any))
-I(IN6_IS_ADDR_MC_NODELOCAL(&in6addr_any))
-I(IN6_IS_ADDR_MC_LINKLOCAL(&in6addr_any))
-I(IN6_IS_ADDR_MC_SITELOCAL(&in6addr_any))
-I(IN6_IS_ADDR_MC_ORGLOCAL(&in6addr_any))
-I(IN6_IS_ADDR_MC_GLOBAL(&in6addr_any))
+I(int,IN6_IS_ADDR_UNSPECIFIED(&in6addr_any))
+I(int,IN6_IS_ADDR_LOOPBACK(&in6addr_any))
+I(int,IN6_IS_ADDR_MULTICAST(&in6addr_any))
+I(int,IN6_IS_ADDR_LINKLOCAL(&in6addr_any))
+I(int,IN6_IS_ADDR_SITELOCAL(&in6addr_any))
+I(int,IN6_IS_ADDR_V4MAPPED(&in6addr_any))
+I(int,IN6_IS_ADDR_V4COMPAT(&in6addr_any))
+I(int,IN6_IS_ADDR_MC_NODELOCAL(&in6addr_any))
+I(int,IN6_IS_ADDR_MC_LINKLOCAL(&in6addr_any))
+I(int,IN6_IS_ADDR_MC_SITELOCAL(&in6addr_any))
+I(int,IN6_IS_ADDR_MC_ORGLOCAL(&in6addr_any))
+I(int,IN6_IS_ADDR_MC_GLOBAL(&in6addr_any))
 }
diff --git a/src/api/setjmp.c b/src/api/setjmp.c
index afcf164..6b956c7 100644
--- a/src/api/setjmp.c
+++ b/src/api/setjmp.c
@@ -4,14 +4,26 @@ static void f()
 {
 T(jmp_buf)
 {void(*p)(jmp_buf,int) = longjmp;}
+#ifdef setjmp
+{int x = setjmp((jmp_buf){0});}
+#else
 {int(*p)(jmp_buf) = setjmp;}
+#endif
 #ifdef _POSIX_C_SOURCE
 T(sigjmp_buf)
 {void(*p)(sigjmp_buf,int) = siglongjmp;}
+#ifdef sigsetjmp
+{int x = sigsetjmp((sigjmp_buf){0});}
+#else
 {int(*p)(sigjmp_buf,int) = sigsetjmp;}
 #endif
+#endif
 #if defined _XOPEN_SOURCE && defined OBSOLETE
 {void(*p)(jmp_buf,int) = _longjmp;}
+#ifdef _setjmp
+{int x = _setjmp((jmp_buf){0});}
+#else
 {int(*p)(jmp_buf) = _setjmp;}
 #endif
+#endif
 }
diff --git a/src/api/stdlib.c b/src/api/stdlib.c
index 7a641d1..84ae68d 100644
--- a/src/api/stdlib.c
+++ b/src/api/stdlib.c
@@ -2,12 +2,13 @@
 #define T(t) (t*)0;
 #define F(t,n) {t *y = &x.n;}
 #define C(n) switch(n){case n:;}
+#define I(t,e) {t x[sizeof(t)==sizeof(e)] = {e};}
 static void f()
 {
 C(EXIT_FAILURE)
 C(EXIT_SUCCESS)
 C(RAND_MAX)
-C(MB_CUR_MAX)
+I(size_t,MB_CUR_MAX)
 {void *x=NULL;}
 T(div_t)
 T(ldiv_t)
diff --git a/src/api/unistd.c b/src/api/unistd.c
index 93355a6..522ccdc 100644
--- a/src/api/unistd.c
+++ b/src/api/unistd.c
@@ -255,7 +255,6 @@ T(intptr_t)
 {int(*p)(const char*,uid_t,gid_t) = chown;}
 {int(*p)(int) = close;}
 {size_t(*p)(int,char*,size_t) = confstr;}
-{char*(*p)(char*) = ctermid;}
 {int(*p)(int) = dup;}
 {int(*p)(int,int) = dup2;}
 {extern char **environ; char **x = environ;};