"buone" (insomma) nuove !
sono riuscito a trovare la repo giusta forse e ora con il comando
[user@host hybrid-wl]$ make -C /lib/modules/`uname -r`/build/ M=`pwd`
non ho più le vecchie 3 righe di errore di mancato Make ma:

make: Entering directory `/usr/src/kernels/2.6.32-431.11.2.el6.x86_64'
CFG80211 API is prefered for this kernel version
Using CFG80211 API
  CC [M]  /usr/local/src/hybrid-wl/src/shared/linux_osl.o
  CC [M]  /usr/local/src/hybrid-wl/src/wl/sys/wl_linux.o
/usr/local/src/hybrid-wl/src/wl/sys/wl_linux.c: In function ‘wl_tkip_printstats’:
/usr/local/src/hybrid-wl/src/wl/sys/wl_linux.c:3246: warning: passing argument 1 of ‘wl->tkipmodops->print_stats’ from incompatible pointer type
/usr/local/src/hybrid-wl/src/wl/sys/wl_linux.c:3246: note: expected ‘struct seq_file *’ but argument is of type ‘char *’
/usr/local/src/hybrid-wl/src/wl/sys/wl_linux.c:3249: warning: passing argument 1 of ‘wl->tkipmodops->print_stats’ from incompatible pointer type
/usr/local/src/hybrid-wl/src/wl/sys/wl_linux.c:3249: note: expected ‘struct seq_file *’ but argument is of type ‘char *’
  CC [M]  /usr/local/src/hybrid-wl/src/wl/sys/wl_iw.o
  CC [M]  /usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.o
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:79: warning: ‘enum tx_power_setting’ declared inside parameter list
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:79: warning: its scope is only this definition or declaration, which is probably not what you want
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c: In function ‘wl_cfg80211_join_ibss’:
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:726: error: ‘struct cfg80211_ibss_params’ has no member named ‘channel’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c: At top level:
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1092: warning: ‘enum tx_power_setting’ declared inside parameter list
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1092: error: parameter 2 (‘type’) has incomplete type
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c: In function ‘wl_cfg80211_set_tx_power’:
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1103: error: ‘TX_POWER_AUTOMATIC’ undeclared (first use in this function)
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1103: error: (Each undeclared identifier is reported only once
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1103: error: for each function it appears in.)
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1105: error: ‘TX_POWER_LIMITED’ undeclared (first use in this function)
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1111: error: ‘TX_POWER_FIXED’ undeclared (first use in this function)
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c: At top level:
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1589: warning: initialization from incompatible pointer type
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1594: warning: initialization from incompatible pointer type
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1595: warning: initialization from incompatible pointer type
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1596: warning: initialization from incompatible pointer type
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1597: warning: initialization from incompatible pointer type
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1598: warning: initialization from incompatible pointer type
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1599: warning: initialization from incompatible pointer type
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c: In function ‘wl_inform_single_bss’:
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1764: error: too few arguments to function ‘ieee80211_channel_to_frequency’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1793: warning: passing argument 1 of ‘cfg80211_put_bss’ from incompatible pointer type
include/net/cfg80211.h:3380: note: expected ‘struct wiphy *’ but argument is of type ‘struct cfg80211_bss *’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1793: error: too few arguments to function ‘cfg80211_put_bss’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c: In function ‘wl_update_bss_info’:
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2046: error: ‘struct cfg80211_bss’ has no member named ‘information_elements’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2047: error: ‘struct cfg80211_bss’ has no member named ‘len_information_elements’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2052: warning: passing argument 1 of ‘cfg80211_put_bss’ from incompatible pointer type
include/net/cfg80211.h:3380: note: expected ‘struct wiphy *’ but argument is of type ‘struct cfg80211_bss *’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2052: error: too few arguments to function ‘cfg80211_put_bss’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c: In function ‘wl_bss_roaming_done’:
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2090: warning: passing argument 2 of ‘cfg80211_roamed’ from incompatible pointer type
include/net/cfg80211.h:3726: note: expected ‘struct ieee80211_channel *’ but argument is of type ‘u8 *’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2090: warning: passing argument 4 of ‘cfg80211_roamed’ makes pointer from integer without a cast
include/net/cfg80211.h:3726: note: expected ‘const u8 *’ but argument is of type ‘s32’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2090: warning: passing argument 5 of ‘cfg80211_roamed’ makes integer from pointer without a cast
include/net/cfg80211.h:3726: note: expected ‘size_t’ but argument is of type ‘u8 *’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2090: warning: passing argument 6 of ‘cfg80211_roamed’ makes pointer from integer without a cast
include/net/cfg80211.h:3726: note: expected ‘const u8 *’ but argument is of type ‘s32’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2090: error: too few arguments to function ‘cfg80211_roamed’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c: In function ‘wl_bss_connect_done’:
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2122: warning: passing argument 2 of ‘cfg80211_roamed’ from incompatible pointer type
include/net/cfg80211.h:3726: note: expected ‘struct ieee80211_channel *’ but argument is of type ‘u8 *’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2122: warning: passing argument 4 of ‘cfg80211_roamed’ makes pointer from integer without a cast
include/net/cfg80211.h:3726: note: expected ‘const u8 *’ but argument is of type ‘s32’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2122: warning: passing argument 5 of ‘cfg80211_roamed’ makes integer from pointer without a cast
include/net/cfg80211.h:3726: note: expected ‘size_t’ but argument is of type ‘u8 *’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2122: warning: passing argument 6 of ‘cfg80211_roamed’ makes pointer from integer without a cast
include/net/cfg80211.h:3726: note: expected ‘const u8 *’ but argument is of type ‘s32’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2122: error: too few arguments to function ‘cfg80211_roamed’
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c: At top level:
/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:2700: fatal error: opening dependency file /usr/local/src/hybrid-wl/src/wl/sys/.wl_cfg80211_hybrid.o.d: Permission denied
compilation terminated.
make[1]: *** [/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.o] Error 1
make: *** [_module_/usr/local/src/hybrid-wl] Error 2
make: Leaving directory `/usr/src/kernels/2.6.32-431.11.2.el6.x86_64'

yum search broadcom mi restituisce:

b43-fwcutter.x86_64 : Firmware extraction tool for Broadcom wireless driver
b43-openfwwf.noarch : Open firmware for some Broadcom 43xx series WLAN chips
b43-tools.x86_64 : Tools for the Broadcom 43xx series WLAN chip

ovviamente tutti e 3 installati.
Mi ricordo che la direcory build inizialmente non esisteva "fisicamente" ma compariva come si può dire, come directory fantasma. In ogni caso ora è vuota.
Seguendo il readme Broadcom http://www.broadcom.com/docs/linux_sta/README.txt mi sono accertato di aver installato 'kernel-headers' 'kernel-devel' 'gcc'.
Manca appunto il make nella build a quanto pare.

Ricapitolando le mie azioni:
- Ho scaricato il driver da qui: http://www.broadcom.com/support/802.11/linux_sta.php
- mkdir -p /usr/local/src/hybrid-wl
- scompattato il driver in questa cartella, ciò che rimane :  lib, Makefile, src
- dati i permessi in questo modo: chown -R mioUtente.root /usr/local/src/hybrid-wl
- non più in root ma in mioUtente : make -C /lib/modules/`uname -r`/build/ M=`pwd`
quindi qui l'errore già postato