Fix spelling

README.md

@@ -89,7 +89,7 @@ Other headers offering other functionality are:
 * m-bitset.h: header for creating bit set,
 * m-string.h: header for creating variable-length string,
 * m-core.h: header for meta-programming with the C preprocessor.
-* m-mutex.h: header for providing a very thin layer accross multiple implementation of mutex/threads.
+* m-mutex.h: header for providing a very thin layer across multiple implementation of mutex/threads.
 * m-algo.h: header for providing various generic algorithms to the previous containers.
 * m-register.h: header for static polymorphic TODO
 
@@ -238,7 +238,7 @@ When using M\*LIB, sometimes (often) the list of errors/warnings generated by th
 even if the error itself is minor. This is more or less the same as the use of template in C++.
 You should focus mainly on the first reported error/warning
 even if the link between what the compiler said and what the error is is not immediate:
-for example, a lack of inclusion of an header, an unkown oplist, a missing argument, a missing method in an oplist, ... Another way to debug is to generate the preprocessed file (by usuallt calling the compiler with the '-E' option instead of '-c') and check what's wrong in the preprocessed file.
+for example, a lack of inclusion of an header, an unknown oplist, a missing argument, a missing method in an oplist, ... Another way to debug is to generate the preprocessed file (by usually calling the compiler with the '-E' option instead of '-c') and check what's wrong in the preprocessed file.
 
 The final goal of the library is to be able to write code like this in pure C while keeping type safety and compile time name resolution:
 
@@ -334,7 +334,7 @@ Example:
 
         (INIT(mpz_init),SET(mpz_set),INIT_SET(mpz_init_set),CLEAR(mpz_clear))
 
-If there is two operations with the same name in an oplist, the left one has the priority. This allows partial overiding.
+If there is two operations with the same name in an oplist, the left one has the priority. This allows partial overriding.
 
 
 Memory Allocation
@@ -1439,7 +1439,7 @@ TODO: document the API.
 
 This header is the internal core of M\*LIB, providing a lot of functionality 
 by extending a lot the preprocessing capability.
-Working with these macros is not easy and the developper needs to know
+Working with these macros is not easy and the developer needs to know
 how the macro preprocessing works.
 It also adds the needed macro for handling the oplist.
 As a consequence, it is needed by all other header files.