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[namespace.posix]
# 16 Library introduction [[library]](./#library)
## 16.4 Library-wide requirements [[requirements]](requirements#namespace.posix)
### 16.4.5 Constraints on programs [[constraints]](constraints#namespace.posix)
#### 16.4.5.2 Namespace use [[namespace.constraints]](namespace.constraints#namespace.posix)
#### 16.4.5.2.2 Namespace posix [namespace.posix]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3107)
The behavior of a C++ program is undefined if it adds declarations or definitions to namespaceposix or to a namespace within namespaceposix unless otherwise specified[.](#1.sentence-1)
The namespace posix is reserved for use by
ISO/IEC/IEEE 9945 and other POSIX standards[.](#1.sentence-2)