diff --git a/libc/include/complex.h b/libc/include/complex.h
index f205abd..1115862 100644
--- a/libc/include/complex.h
+++ b/libc/include/complex.h
@@ -53,76 +53,190 @@
 
 /* 7.3.5 Trigonometric functions */
 /* 7.3.5.1 The cacos functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex cacos(double complex __z) __INTRODUCED_IN(23);
 float complex cacosf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex cacosl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 /* 7.3.5.2 The casin functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex casin(double complex __z) __INTRODUCED_IN(23);
 float complex casinf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex casinl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 /* 7.3.5.1 The catan functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex catan(double complex __z) __INTRODUCED_IN(23);
 float complex catanf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex catanl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 /* 7.3.5.1 The ccos functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex ccos(double complex __z) __INTRODUCED_IN(23);
 float complex ccosf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex ccosl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 /* 7.3.5.1 The csin functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex csin(double complex __z) __INTRODUCED_IN(23);
 float complex csinf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex csinl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 /* 7.3.5.1 The ctan functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex ctan(double complex __z) __INTRODUCED_IN(23);
 float complex ctanf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex ctanl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 
 /* 7.3.6 Hyperbolic functions */
 /* 7.3.6.1 The cacosh functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex cacosh(double complex __z) __INTRODUCED_IN(23);
 float complex cacoshf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex cacoshl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 /* 7.3.6.2 The casinh functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex casinh(double complex __z) __INTRODUCED_IN(23);
 float complex casinhf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex casinhl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 /* 7.3.6.3 The catanh functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex catanh(double complex __z) __INTRODUCED_IN(23);
 float complex catanhf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex catanhl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 /* 7.3.6.4 The ccosh functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex ccosh(double complex __z) __INTRODUCED_IN(23);
 float complex ccoshf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex ccoshl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 /* 7.3.6.5 The csinh functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex csinh(double complex __z) __INTRODUCED_IN(23);
 float complex csinhf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex csinhl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 /* 7.3.6.6 The ctanh functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex ctanh(double complex __z) __INTRODUCED_IN(23);
 float complex ctanhf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex ctanhl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 
 /* 7.3.7 Exponential and logarithmic functions */
 /* 7.3.7.1 The cexp functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex cexp(double complex __z) __INTRODUCED_IN(23);
 float complex cexpf(float complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 long double complex cexpl(long double complex __z) __INTRODUCED_IN(26);
 /* 7.3.7.2 The clog functions */
 double complex clog(double complex __z) __INTRODUCED_IN(26);
 float complex clogf(float complex __z) __INTRODUCED_IN(26);
 long double complex clogl(long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 
 /* 7.3.8 Power and absolute-value functions */
 /* 7.3.8.1 The cabs functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double cabs(double complex __z) __INTRODUCED_IN(23);
 float cabsf(float complex __z) __INTRODUCED_IN(23);
 long double cabsl(long double complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
 /* 7.3.8.2 The cpow functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(26)
 double complex cpow(double complex __x, double complex __z) __INTRODUCED_IN(26);
 float complex cpowf(float complex __x, float complex __z) __INTRODUCED_IN(26);
 long double complex cpowl(long double complex __x, long double complex __z) __INTRODUCED_IN(26);
+#endif /* __BIONIC_AVAILABILITY_GUARD(26) */
+
 /* 7.3.8.3 The csqrt functions */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 double complex csqrt(double complex __z) __INTRODUCED_IN(23);
 float complex csqrtf(float complex __z) __INTRODUCED_IN(23);
 long double complex csqrtl(long double complex __z) __INTRODUCED_IN(23);
@@ -148,6 +262,8 @@
 double creal(double complex __z) __INTRODUCED_IN(23);
 float crealf(float complex __z) __INTRODUCED_IN(23);
 long double creall(long double complex __z) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
 
 __END_DECLS