Dear all, I'm having exactly the same problem trying to install pcaMethods on R 2.12.2, on a CentOS 5.4 x86_64: biocLite("pcaMethods") Using R version 2.12.2, biocinstall version 2.7.4. Installing Bioconductor version 2.7 packages: [1] "pcaMethods" Please wait... trying URL 'http://www.bioconductor.org/packages/2.7/bioc/src/contrib/pcaMethods_ 1.32.0.tar.gz' Content type 'application/x-gzip' length 467350 bytes (456 Kb) opened URL ================================================== downloaded 456 Kb * installing *source* package ?pcaMethods? ... ** libs g++ -I/usr/local/R-2.12.2/lib64/R/include -I/usr/local/R-2.12.2/lib64/R/library/Rcpp/include -I/usr/local/include -fpic -g -O2 -c nipals.cpp -o nipals.o nipals.cpp: In function ?SEXPREC* Nipals(SEXPREC*, SEXPREC*)?: nipals.cpp:37: error: ?RcppParams? was not declared in this scope nipals.cpp:37: error: expected `;' before ?rparams? nipals.cpp:38: error: ?rparams? was not declared in this scope nipals.cpp:42: error: ?RcppMatrix? was not declared in this scope nipals.cpp:42: error: expected primary-expression before ?double? nipals.cpp:42: error: expected `;' before ?double? nipals.cpp:43: error: expected primary-expression before ?double? nipals.cpp:43: error: expected `;' before ?double? nipals.cpp:44: error: ?mat? was not declared in this scope nipals.cpp:46: error: expected primary-expression before ?double? nipals.cpp:46: error: expected `;' before ?double? nipals.cpp:47: error: expected primary-expression before ?double? nipals.cpp:47: error: expected `;' before ?double? nipals.cpp:48: error: expected primary-expression before ?double? nipals.cpp:48: error: expected `;' before ?double? nipals.cpp:120: error: ?est_mat? was not declared in this scope nipals.cpp:121: error: ?omat? was not declared in this scope nipals.cpp:130: error: ?tt? was not declared in this scope nipals.cpp:133: error: ?pp? was not declared in this scope nipals.cpp:146: error: ?RcppResultSet? was not declared in this scope nipals.cpp:146: error: expected `;' before ?rs? nipals.cpp:148: error: expected primary-expression before ?double? nipals.cpp:148: error: expected `;' before ?double? nipals.cpp:149: error: expected primary-expression before ?double? nipals.cpp:149: error: expected `;' before ?double? nipals.cpp:152: error: ?ttt? was not declared in this scope nipals.cpp:152: error: ?tt? was not declared in this scope nipals.cpp:157: error: ?ppp? was not declared in this scope nipals.cpp:157: error: ?pp? was not declared in this scope nipals.cpp:160: error: ?rs? was not declared in this scope nipals.cpp:160: error: ?ttt? was not declared in this scope nipals.cpp:161: error: ?ppp? was not declared in this scope nipals.cpp:163: error: ?rs? was not declared in this scope nipals.cpp:163: error: ?tt? was not declared in this scope nipals.cpp:164: error: ?pp? was not declared in this scope nipals.cpp:166: error: ?rs? was not declared in this scope nipals.cpp:170: error: ?copyMessageToR? was not declared in this scope nipals.cpp:172: error: ?copyMessageToR? was not declared in this scope nipals.cpp:175: error: ?copyMessageToR? was not declared in this scope nipals.cpp:177: error: ?copyMessageToR? was not declared in this scope make: *** [nipals.o] Error 1 ERROR: compilation failed for package ?pcaMethods? * removing ?/usr/local/R-2.12.2/lib64/R/library/pcaMethods? Have you find any solution? thanks in advance, ALfons