diff --git a/dev-cpp/tlfloat/files/tlfloat-1.17.1_p20250711-libcxx.patch b/dev-cpp/tlfloat/files/tlfloat-1.17.1_p20250711-libcxx.patch
new file mode 100644
index 0000000000000..dff96ff8d0043
--- /dev/null
+++ b/dev-cpp/tlfloat/files/tlfloat-1.17.1_p20250711-libcxx.patch
@@ -0,0 +1,12 @@
+Fix build with libc++
+Upstream PR: https://github.com/shibatch/tlfloat/pull/6
+--- a/src/include/tlfloat/tlfloat.hpp
++++ b/src/include/tlfloat/tlfloat.hpp
+@@ -8,6 +8,7 @@
+ #define __TLFLOAT_HPP_INCLUDED__
+ 
+ #include <cstdio>
++#include <type_traits>
+ 
+ #include <tlfloat/bigint.hpp>
+ 
diff --git a/dev-cpp/tlfloat/tlfloat-1.17.1_p20250711.ebuild b/dev-cpp/tlfloat/tlfloat-1.17.1_p20250711.ebuild
index f954b85a20978..2e016dda40158 100644
--- a/dev-cpp/tlfloat/tlfloat-1.17.1_p20250711.ebuild
+++ b/dev-cpp/tlfloat/tlfloat-1.17.1_p20250711.ebuild
@@ -22,7 +22,10 @@ KEYWORDS="~amd64 ~arm64 ~riscv"
 IUSE="test"
 RESTRICT="!test? ( test )"
 
-PATCHES=( "${FILESDIR}"/${P}-fPIC.patch )
+PATCHES=(
+	"${FILESDIR}"/${P}-fPIC.patch
+	"${FILESDIR}"/${P}-libcxx.patch
+)
 
 src_configure() {
 	local mycmakeargs=(