Postgresql90, Postgresql91 - /usr/include/unistd.h:689:26: error: expected identifier

[ilya@…]

usr/bin/clang -pipe -O2 -arch x86_64 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wformat-security -fno-strict-aliasing -fwrapv  -I. -I. -I../../src/include -I/opt/local/include -I/opt/local/include/ossp -I/opt/local/include/libxml2  -I/opt/local/include  -c -o uuid-ossp.o uuid-ossp.c
In file included from uuid-ossp.c:28:
In file included from /opt/local/include/ossp/uuid.h:38:
/usr/include/unistd.h:689:26: error: expected identifier
int      gethostuuid(uuid_t, const struct timespec *) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
                             ^
In file included from uuid-ossp.c:28:
/opt/local/include/ossp/uuid.h:94:24: error: typedef redefinition with different types ('struct uuid_st' vs '__darwin_uuid_t' (aka 'unsigned char [16]'))
typedef struct uuid_st uuid_t;
                       ^
/usr/include/uuid/uuid.h:42:25: note: previous definition is here
typedef __darwin_uuid_t uuid_t;
                        ^
In file included from uuid-ossp.c:28:
/opt/local/include/ossp/uuid.h:107:22: error: conflicting types for 'uuid_compare'
extern uuid_rc_t     uuid_compare  (const uuid_t  *_uuid, const uuid_t *_uuid2, int *_result);
                     ^
/usr/include/uuid/uuid.h:59:5: note: previous declaration is here
int uuid_compare(const uuid_t uu1, const uuid_t uu2);
    ^
3 errors generated.
make: *** [uuid-ossp.o] Error 1